Far West Region Lithic Material

Materials Identification Guide

Far West Region Lithic Material

Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated Formation / Member
Afton Canyon Agate AKA: Barstow Desert Coral Chalcedony				shades of white, red, and yellow. Jasp-agate also occurs	California
Afton Canyon Jasper				Includes jasper red and yellow.	California
Agate Jasper				Ranges from yellow to brown or green. Part if the material will be banded and be translucent while the remaining material will be mottled and opaque.	Western North America
Agort Chert				Light gray	Nevada	Noh Formation
Ajax Chert AKA: Emerald Chert				Ranges from a light gray to a creamy white color	Utah	Emerald Dolomite Member of the Ajax Limestone Formation
Alaska Canyon Obsidian				Black with phenocrysts and inclusions present.	California
Alvord Mountains Jasper / Agate / Palm Wood					California
Amargosa Valley Obsidian				Black	Nevada	Tolicha Wash / Sarcobatus Flats Float
Amboy Crater Jasper					California
Anderson Dam Plume Agate AKA: Peanut Jasper				Colors of red, white, blue, and yellow with plumes.	California
Andesite Generic Type					North America	Varies
Annadel Obsidian				Ranges from a grayish black to a brownish black or black. Banding is commonly present and rarely reddish brown streaking may occur.	California	Lower member of the Sonoma Volcanics.
Antioch Petrified Wood				Colors of a dark cream to dark brown and black with a white cortex.	California
Arcturus Chert				Light purple	Nevada	Arcturus Formation
Argillite (Generic type)				Light to dark green, but may range to various shades of gray	North America
Ash Hill Carnelian				Ranges from a light orangish pink to a dark orange.	California
Badger Creek Obsidian				Bluish gray	Nevada
Bald Peak Basalt				Dark gray color with a light brownish gray cortex	California
Basalt				Ranges from black to gray	Western North America
Battle Mountain Chalcedony				White with light greenish white inclusions	Nevada
Battle Mountain Jasper				Ranges from a white to tan or purple	Nevada
Beacon Flat Chert				Light Gray	Nevada	Beacon Flat Formation
Beacon Peak Dolomite / Chert				Ranges from a light gray to brown.	Nevada	Beacon Peak Dolomite Formation
Bear Mountain Jasper					California
Beaver Dam Agate / Petrified Wood				Primarily white with shades of orange, pink, and red.	Utah, Nevada
Beaver Dam Jasper				Shades of red	Utah, Nevada
Beaver Dam Wonderstone / Banded Rhyolite				Banded with colors of cream, brown, red, and yellow	Utah, Nevada
Bees Wax Chert				Ranges from a white gray to a yellow brown	California
Berkeley Agate				Ranges from a light grayish white to a dark bluish gray	California
Big River Rainbow Jasper				Multi-colored banded jasper	California, Arizona
Bingham Quartzite				Most commonly white and banding may be present	Utah	Bingham Quartzite Formation
Black Mountain Basalt				Occurs as both vesicular and compact olivine basalt	California
Black Mountain Obsidian				Black	Utah
Black Rock Obsidian				Ranges from a dark gray to black with phenocyst (snowflake) and reddish brown streaking (mohagany) commonly present.	Utah
Blue Canyon Quartzite				Dark gray color	California	Blue Canyon Formation
Blue Ice Moss Agate				Clear blue or blue matrix with dendritic inclusions.	California
Blue Mountain Obsidian AKA: Steel (Steele) Swamp Obsidian				Greenish black color	California
Blue Springs Obsidian AKA: Sugar Hill Switchback Obsidian				Black	California
Blue Valley Agate				Black with blue bands	Utah
Bluebell Chert				More banded than mottled and ranges from a buff to a dusty bluish gray	Utah	Bluebell Limestone Formation
Bluepoint Chert				Gray	Nevada	Bluepoint Limestone FOrmation
Bodie Hills Obsidian AKA: Grove Hill Obsidian				Ranges from black to almost clear.	California, Nevada
Borax Lake Obsidian				Ranges from a dark grayish black to a gray with a "frothy" appearance due to gas voids commonly present.	California	Clear Lake Volcanics
Bordwell Springs Obsidian AKA: Dolly Varden, Fox Mountain Obsidian				Black	Nevada
Boron Dry Lake Jasper AKA: Boron Dry Lake Petrified Wood					California
Bouquet Jasper				Mottled jasper with colors of red, brown, yellow, and green.	California
Box Springs Obsidian				Black	Nevada
Brianhead Chert				Primarily white and gray and may have areas of red and yellow.	Utah	Brianhead Formation
Bristol Mountains Obsidian AKA: Amboy Crater, Bagdad Obsidian				Gray with banding commonly present. The cortex is a reddish brown.	California
Browns Bench Obsidian AKA: Goose Creek, Hudson Ridge, Jackpot Obsidian				Black	Idaho, Nevada, Utah	Bruneau / Jarbidge Volcanic Field
Bryce Canyon Petrified Wood				Colors of red, brown, yellow, and white. Wood grain and rings are commonly present.	Utah
Bruneau Canyon Jasper				Ranges in color from varying shades or tan and browns to reds and greens with cream colored eye or egg patterns.	Idaho
Buck Mountain Obsidian AKA: Nelson Quarry, North Fork, Tick Rise Obsidian				Ranges from a medium gray to black, flow banding may be present.	California
Buckskin Mountain Chert AKA: Carlin Canyon Chert				Brown	Nevada	Buckskin Mountain Formation
Burdell Mountain Obsidian				Glassy black with many inclusions including felspar.	California	Tolay Volcanics or the lower Somoma Volcanics
Butte Mountain Obsidian				Black	Nevada
Butterfield Chert				Black with concentric bands of dark gray.	Utah	Butterfield Limestone Member of the Bingham Quartzite
Buzzard Roost Obsidian				Multi-colored	California
Cady Mountain Agate / Jasper AKA: Wide Valley Agate / Jasper				Colors of red, white, brown, and yellow. Yellow dendritic inclusion may occur (moss and flame agate)	California
Cal-Azur Blue Chalcedony				Red rhyolite cortex with a blue chalcedony interior.	California
Calico Mountain Agate / Chalcedony / Jasper / Petrified Palm Wood AKA: Yermo Agate / Palm Root				Jasper are shades of brown with white veins of quartz.	California
Callahan Obsidian				Homogenous black to a bluish black with no banding present..	California
Camp Irwin Chapinite (Agate)				Brecciated nodular agate with colors of red, yellow, and brown.	California
Canyon View Palm Wood				Agatized black palm wood	California
Cap Winn Jasperoid Chert				Red and grayish green.	Nevada	Cap Winn Member of the Schoonover Formation
Carlin Canyon Chert				Ranges from a dark brown to black	Nevada	Carlin Canyon Formation
Carnelian Generic Type				Translucent and varies in shades from reddish brown to reddish orange.	North America	Varies
Casa Diablo Obsidian AKA: See list on page				Black	California
Castle Butte Agate / Jasper / Palm Wood				Colors of yellows, reds, greens, and gray.	California
Castro Canyon Agate				Red agate	Utah
Cave Mountain Jasper / Agate / Chalcedony				Jasper is multicolored, called "rainbow jasper" and the agate is red, chalcedony is grayish blue.	California
Cave Springs Obsidian / Vitrophyre				Black	Nevada
Cedar Breaks Moss Agate				Ranges from red to yellow with black dendritic inclusions.	Utah
Cedar Canyon Agate				Colors of red, brown, black, and white.	Utah
Central Chalcedony				Gray color	Utah
Challis Chancedony				Ranges from gray to a bluish gray or white.	Idaho
Cherry Creek Petrified Wood				Shades of red and pink, tans, browns, and black. Wood grain or rings are present.	Nevada
Cherry Springs Chert				Ranges from a greenish gray to an emerald green	Nevada	Cherry Springs Chert Formation
Chicken Track Jasper				Shades of brown, blue, and white	Nevada
Chico Martinez Chert				Range from a light grayish white to a medium gray.	California	Chico Martinez Chert Member of the Monterey Formation
Chimney Creek Reservoir Obsidian				Black	Nevada
China Lake Plume Agate				Greenish exterior with brownish plumes forming a high contrast interior with colors of red, yellow, and white.	California
Chokecherry Chert				Primarily dark gray to black and mottling may be present.	Utah	Chokecherry Dolomite Formation
Chuckwalla Chalcedony				Bluish gray	California
Cico Chert				Ranges from translucent white to gray or tan to brown. Less commonly may be a reddish brown or purplish gray.	California
Claremont Chert				Ranges from a light brownish white to a a medium brown or medium gray.	California
Clayton Ridge Obsidian AKA: Montezuma Range Obsidian				Black	Nevada
Clipper Gap Chert				Ranges from a light blue or bluish gray to gray.	California	Clipper Gap Formation
Cloverdale Canyon Obsidian				Black	Nevada
Coaldale Chert					Nevada
Condor Chert				Black	Nevada	Condor Member of the Highland Peak Formation
Comus Chert				Ranges from a green to a dark gray, brown or black.	Nevada	Comus Formation
Coso Hot Springs Obsidian AKA: See list on page				Black	California	Coso Volcanic Field
Cougar Butte Obsidian				Milky gray to black color that is tinged with a splotchy pinkish purple cast with phenocysts inclusions (snowflake obsidian)	California
Cow Creek Obsidian Tuscan Volcanic Group				Banded gray with reddish brown streaks commonly occurring (mahogany obsidian).	California	Tuscan Volcanics
Cowshead Lake Obsidian AKA: Bidwell Mountain Obsidian				Ranges from black to a black, gray, and purple.	California
Coyote Springs Obsidian AKA: Nut Mountain Obsidian				Black	Nevada
Craine Creek Obsidian AKA: Bug Hot Springs Obsidian				Black	Nevada
Crow Springs Obsidian				Black	Nevada
Crystal Summit Obsidian (Napa Valley Obsidian)				Black with banding and gas voids present.	California	Upper member of the Sonoma Volcanics
Dacite Generic Type				Most commonly a light to dark gray or black	Western North America	Varies
Davis Creek Obsidian				Range from black to multi-colored.	California
Death Valley Agate AKA: Death Valley Plume, Death Valley Golden, and Wingate Pass Agate				Red with yellow plumes or red with yellow poppies	California
Death Valley Jasper AKA: Navajo Blanket Jasper, Indian Paintstone				colors of red, yellow, tan, and black.	California
Deep Creek Agate / Petrified Wood					California
Del Prat Spring Obsidian				Vitreous black with banding occurring	California
Devil Peak Obsidian (marekanites) AKA: Roach Lake, Umpire Obsidian				Black with phenocrysts inclusion occur on material from the east Devils Peak.	Nevada
Devils Gate Chert				Chert is a dark gray. Light and dark gray striped dolomite also occurs.	Nevada	Devils Gate Limestone Formation
Disaster Peak Jasper				Shaded of brown and tan with darker banding commonly forming "landscapes".	Nevada, Oregon
Dodge Reservoir Obsidian				gray with phenocysts and inclusions	Nevada
Double H Mountains Obsidian				Ranges from black to gray, green or blue.	Nevada
Drum Mountain Plume Agate / Moss Agate / Jasper				Occurs in multiple colors including red, yellow, purple, white, and brown.	Utah
Duck Flat Obsidian				Primarily gray to grayish black or black with reddish brown patches or streaking commonly present (mahogany obsidian)	Nevada
Dugway Geodes				Banded bluish gray to gray with a hollow interior	Utah
Dulzura Jasper				ribbed with colors of red and yellow.	California, Baja California
Duncan Chert				Ranges from a a brownish gray to brown	California
Eagle Crags Agate				Range from a blue sagentic agate to a moss agate with a white to clear matrix with dendritic inclusions	California
Eagle Peak Agate				Colors of salmon, black, and white.	California
El Regino Obsidian				Primarily black though red does occur.	Baja California
Ely Chert				Pinkish gray to a dark gray or a cream to brown.	Nevada	Ely Limestone Formation
Ely Springs Chert				Ranges from a dark gray to a smoky brown.	Nevada	Ely Springs Dolomite Formation
Emigrant Chert				Ranges from a dark gray to black	Nevada	Emigrant Limestone Formation
Escalante Agate / Petrified Wood				Petrified wood has colors of yellow, brown, red, and white, wood grain and rings are commonly present.	Utah
Eureka Agate AKA: Eureka Jasper				Colors of red and yellow. This material has been referred to as Eureka Jasper due to the color.	Utah
Eureka Basalt				Dark gray	Nevada
Eureka Quartzite AKA: Standbury Quartzite				Ranges from dense white dark gray quartzite to a vitreous tan to brown, milky white, pink, purple, or red orthoquartzite.	California, Nevada, Utah	Eureka Quartzite Formation
Fairview Chalcedony / Opal AKA: Dixie Valley Chalcedony				Banded	Nevada
Farmington Chert				Ranges from a most common pale green to a light tannish green.	California
Ferguson Mountain Chert				Ranges from a white to light brown or gray.	Nevada	Ferguson Mountain Formation
Ferguson Wash Obsidian AKA: Dead Cedar Wash, Ferguson Flat Obsidian				Black	Nevada, Utah
Fiddlers Canyon Moss Agate				Ranges from a blue with black dendritic inclusions to a multi colored with colors of white, pink, and brownish orange with dendritic inclusions.	Utah
Field Siding Agate / Jasper / Palm Wood					California
Fish Haven Chert				Ranges from a grayish tan to black weathering shades of brown.	Utah, Nevada, Idaho	Fish Haven Dolomite Formation
Fish Lake Valley Obsidian				Black	Nevada
Fish Springs Obsidian				Black	California
Franciscan Chert				Ranges from brown to reddish brown or yellow brown, white to gray, greenish gray to black. Generally has reddish or greenish hues	California	Franciscan Formation
Franz Valley Obsidian				Ranges from a banded black to a unique greenish brown color or a "battleship" gray color.	California	Upper member of Sonoma Volcanics
Frenchie Creek Rhyolite				Maroon or black.	Nevada	Frenchie Creek Rhyolite Member (upper member) of the Pony Trail Group
Garden City Chert				Ranges from a light to dark grayish blue. Black layers of chert also occur.	Utah, Idaho	Garden City Limestone Formation
Gardner Chert				Ranges from a gray to a dark grayish blue or black	Utah	Gardner Limestone Formation
Garfield Hills Obsidian AKA: Hawthorne Obsidian				Black	Nevada
Gem Hill Jasper / Agate / Petrified Wood				Iris agate, petrified wood / roots and "very colorful" jasper are also found at this location	California
Gerster Chert				Ranges from a tan to a light gray or light bluish gray with a dark rusty brown cortex. Banding was reported in southern Pequop Mountains.	Utah, Nevada	Gerster Limestone Formation
Glass Mountain Obsidian AKA: See list				Ranges from a black to gray with banding commonly present	California
Goldfield Jasper AKA: Gemfield Jasper				Colors of red, yellow, gray, light greenish gray, to dark green	Nevada
Goodwin Chert				Ranges from white to gray	Nevada	Goodwin Limestone Formation
Graham Pass Agate				Sagenitic agate	California
Grandeur Chert				Light gray	Utah	Grandeur Limestone Formation
Grasshopper Flat Obsidian AKA: Glittering Mountain, Red Switchback				Banded milky gray	California
Graveyard Point Plume Agate				Plume agate with colors of red, yellow, and brown with a matrix of white to a bluish or grayish white.	Idaho, Oregon
Guadalupe Poppy Jasper AKA: Morgan Hill Jasper				Ranges from an orangish yellow to a greenish yellow or red with orbs that have a red exterior margin and a white interior.	California
Hales Chert				Ranges from a gray to a bluish gray or tan.	Nevada	Hales Limestone Formation
Hanson Creek Chert				Dark gray to black dolomite with dark gray to bluish black or black chert nodules and lenses.	Nevada	Hanson Creek Formation
Harris Flats Obsidian				Ranges from a bluish gray with reddish brown and black streaking to a translucent black.	California
Havallah Chert AKA: Trenton Canyon Chert				Colors of red, green, purple, and gray	Nevada	Trenton Canyon Member of the Havallah Formation
Havallah Greenstone				Green	Nevada	Havallah Formation
Havallah Mudstone / Argillite				Dark brown with "feathery algae" and worm tracks present.	Nevada	Havallah Formation
Hawks Valley Obsidian				Black	Oregon, Nevada
Hidden Canyon Jasper				Banded with colors of yellow, red, and green. Mossy dendritic inclusions may be present.	Utah
Hidden Valley Jasper				Shades of red, brownish yellow, and white	Idaho, Oregon
Hog Ranch Obsidian				Black	Nevada
Hoodoo Petrified Wood AKA: Hoodoo Creek Petrified Wood				Shades of reds, orange, tans and white with wood grain and rings present..	Oregon	Hoodoo Formation
Hornitos Poppy Jasper				Colors of red, orange, and yellow with white orbs	California
Horse Canyon Agate				Includes banded, lace, plume, moss, and various other types of agate	California
Horse Canyon Spring Obsidian				Black	Nevada
Hubbard Basin Petrified Wood				Ranges from a light brown to brown with "wood grain" or rings.	Nevada
Humboldt Chert				Red, green, and black	Nevada	Humboldt Formation
Indian Blanket Jasper				Soft subtle tones of red, purple, brown, black, yellow, and tan.	Utah
Ingleside Chert				Brownish red color, yellows and green may be present. May range to a jasper.	California	Ingleside Member (second upper member) of the Franciscan Formation
Isla Angel de la Guarda Obsidian				Black	Baja California
Jasp-Agate Hill Agate				Produced moss agate, plume agate and jasp-agate	California
Jess Valley Obsidian				Black	California
Joana Chert				Ranges from a light brown to a reddish brown or purplish black to black.	Nevada	Joana Formation
Jordan Chert				Black	Utah	Jordan Limestone Member of the Bingham Quartzite Formation
Junction Obsidian				Black to pinkish black	California
Kane Springs Wash Obsidian AKA: Delmar Mountains Obsidian				Black	Nevada
Kelly Mountain Obsidian AKA: Mosquito Springs Obsidian				Poor quality black with numerous vesicles and inclusions.	California
Kiabab Chert				Mottled with whites, light browns, tans, and light grays with a brown cortex	Nevada, Utah, Arizona	Kiabab Limestone Formation
Kiekierly Obsidian				Black	Baja California
Kobeh Chert				Brownish gray to a light gray	Nevada	Kobeh Member of the McColley Canyon Formation.
Kramer Hills Agate / Petrified Wood				Includes moss and plume agate and has colors of yellow, red, white, and green with inclusions.	California
Lágrimas de Apache Obsidian				Black	Baja California
Lake Havasu Agate / Jasper				Ranges from a white to a bluish white with yellowish browns.	California
Laketown Chert				Light gray	Wyoming, Utah, Idaho, Nevada	Laketown Dolomite Member of the Guilmette Formation
Lassen Creek Obsidian				Ranges from black to black and red, and purple.	California
Last Change Canyon Petrified Wood				Shades of browns, tans, white and black with wood grain or rings present.	California
Lavic Agate AKA: Lavic Lake Agate				Colors of red, green, brown, and white and includes sagenitic and moss agates, jaspers, agate-jaspers.	California
Lavic Jasper				Often a brecciated jasper with colors of red, green, brown, and white	California
Lead Pipe Springs Chalcedony AKA: Lead Pipe Springs Agate				Beautiful sky blue to a royal blue chalcedony commonly with a red rhyolite matrix. Blue sagenitic and moss agate also occur.	California
Lenox Chert				Ranges from dark bluish black to black.	Utah
Levan Agate				Blue	Utah
Levan Black Agate				Ranges from a dark gray to black	Utah
Lodgepole Obsidian				Ranges from black to black with reddish brown streaking and large patches (mahogany obsidian).	California
Lone Mountain Dolomite / Chert				Chert is gray and the dolomite ranges from a light gray to a dark gray.	Nevada	Lone Mountain Dolomite Formation
Lonely Butte Agate / Jasper				Ranges from white to mottled white with shades of light brown and light blue.	California
Lonely Butte Petrified Wood				Shaded of medium to dark brown.	California
Los Guilicos Obsidian				Type A ranges from a gray to a greenish gray and lacks any inclusions. Type B is a greenish color with numerous phenocyctes.	California	Sonoma Volcanics
Lost Iron Wells Obsidian AKA: Glittering Mountain Obsidian				Ranges from gray to black with broad banding and streaking present.	California
Mammoth Obsidian				Black	California
Marysvale Obsidian				Black	Utah	Mount Belknap Volcanic Series
Massacre Lake / Guano Valley Obsidian AKA: See list				Black	Nevada, Oregon
McDermitt Jasper AKA: Gary Green Jasper				Scenic jasper with shades of blue, brown and white	Oregon, Nevada
McDermitt Petrified Wood				Shades of dark brown with a white cortex. Wood grains and rings are present.	Oregon, Nevada
McKittrick Chert				Ranges from a white to a pale grayish white with light streaks of purple.	California	McKittrick Opalized Shale Formation
Meg's Crown Obsidian (Napa Valley Obsidian)				Black with gray banding and swirls present. In thin sections is a pale gray with dark banding.	California	Upper member of Sonoma Volcanics
Mendha Chert				Ranges from a dark gray to black.	Nevada
Middle Fork Obsidian				Black	California
Mineral Mountain Obsidian AKA: Pumice Mine, Wild Horse Canyon Obsidian				Black	Utah
Modena Obsidian AKA: Dry Valley, Panaca Summit, Pinon Point Obsidian				Opaque to slightly translucent black with faint translucent gray banding commonly present.	Nevada, Utah
Moit Moss Agate				Translucent golden brown matrix with brownish black dendritic inclusions.	California	Valley Springs Formation
Moleen Chert				Ranges from a gray to a dark gray weathering brown.	Nevada
Mono Craters Obsidian				Black	California
Mono Glass Mountain Obsidian				Ranges from gray to black with a "woody grain" appearance. Reddish brown streaking also occurs (mahogany obsidian).	California
Monterey Chert				Ranges from a chert to a opalitic cherty shale or chalcedony with colors from a dark brown to a black, may be banded dark brown and a lighter brown	California	Monterey Formation
Montgomery Chert				.Black	California	Montgomery Limestone Formation
Morgan's Well Plume Agate				Black plumes.	California
Mosquito Lake Obsidian AKA: Mosquito Creek Obsidian				Milky bluish gray	Nevada
Mt. Hicks Obsidian AKA: Anchorite Hills Obsidian				Black	Nevada
Mt. Konocti Obsidian				Ranges from a gray to black or brown black and a brick reddish brown.	California	Clear Lake Volcanics
Mt. Majuba Obsidian AKA: Oreana, Rabbit Hole, Poker Brown Wash, Seven Troughs Obsidian				Black	Nevada
Mule Canyon Agate / Jasp-Agate				Includes sagenitic, moss agates, jasp-agate.	California
Mule Canyon Palm Root				Colors of brown, cream, white, pink, and red	California
Murdock Mountain Chert				Ranges from a light gray to a bluish gray or tannish gray.	Utah, Nevada	Murdock Mountain Limestone Formation
Murphy Hot Springs Obsidian AKA: Murphy Springs Obsidian				Black	Idaho
Napa Glass Mountain Obsidian (Napa Valley Obsidian)				Ranges from a black to a pale charcoal gray or a coffee brown with streaking of coffee brown or reddish brown occurring.	California	Upper member of the Sonoma Volcanics
Needle Grass Springs Obsidian				Ranges from black to black and red or red.	Nevada
Nellie Springs Ignimbrite				Variably colored dark ignimbrite with ash inclusions and crystals.	Nevada
Newcastle Chalcedony					Utah
Nipomo Opalite / Agate				Colors of blue, green, and gray ranging from opaque to translucent. Agates includes sagenitic and moss agates.	California
North Cottonwood Flat Obsidian				Ranges from black to a pinkish black	California
Notch Peak Chert				Dark colored gray	Nevada, Utah	Notch Peak Formation
Nugget Sandstone				Ranges from buff to pink.	Colorado, Utah, Nevada	Chug Water Formation of the Thrust Belt
Obsidian AKA: Volcanic Glass				Black to black with bands of dark reds (mahogany obsidian) or white flakes (snowflake obsidian)	Western North America	Volcanic
Obsidian Butte Obsidian AKA: See list				Black	Nevada
Odessa Canyon Sagenite				Yellow, black banded, and picture agate	California
Oil Agate				Translucent brownish matrix with black speck and splotches	California
Old Ranch Jasper Agate				Colors of red, white, yellow, and brown	California
Opal Mountain Opal / Chalcedony / Moss Agate				Opal occurs colors including peach, white pink, and red, Opal Mountain Chalcedony is clear to light gray.	California
Opal Spring Chalcedony				Red	Nevada
Opohonga Chert				White	Utah	Opohonga Limestone Formation
.Owyhee Jasper AKA: Antelope Jasper				Scenic jasper with colors of brown, tan and cream. Colors of reds, blues, and greens may also occur	Oregon, Idaho
Owyhee Obsidian AKA: Brown's Castle Obsidian, Oreana Obsidian, Toy Pass Obsidian				Primarily black reddish brown patches and streaking may occur	Oregon, Idaho
Palo Verde Agate				Includes paisley agates and black agates.	California
Panamint Carnelian				Ranges from a deep brownish red to a light reddish brown.	California
Paradise Ridge Obsidian Tuscan Volcanic Group				Black	California	Tuscan Volcanics
Paradise Valley Obsidian AKA: Black Ridge, Santa Rosa Obsidian				Black	Nevada
Pastelite Jasper				Colors of pink, orange, brown, and white	California
Paul Bunyan Agate				Intense red color with branch like inclusions extending into an opaque white chalcedony.	California
Paynes - Inks Creek Obsidian Tuscan Volcanic Group				Black	California	Tuscan Volcanics
Peale Chert				Colors of black, gray and red and commonly has red banding and veins of white quartz	California	Peale Formation
Peale Quartzite				Gray	California	Peale Formation
Petrified Wood				Color based on the minerals present during the process. It can range from black green to blue yellow, red, and brown , pink and orange, yellow , or white	California, Nevada, Utah	Varies
Phonolite Hill Obsidian				Primarily gray ranging to black. Flow banding may be present.	Utah	Marysvale Volcanic Field
Phosphoria Chert AKA: Tosi Chert, Big Horn Chert				Ranges from colors of red, maroon, purple, orangish red, green, black and white.	Wyoming, Montana, Utah, Idaho, Nevada	Tosi Member of the Phosphoria Formation
Piedra de Lumbre Chert				color is most commonly a yellowish brown to gray but may range from black bright red or white with dark browns and greens being rare.	California
Pine Canyon Chert				Black	Utah	Pine Canyon Limestone Formation
Pine Grove Hills Obsidian				Ranges from black to almost clear.	Nevada
Pink Lady Obsidian				Ranges from black to a iridescent silver sheen to a green sheen or pink sheen.	California
Pinto Peak Obsidian				Black	Nevada
Pisgah Crater Agate				Ranges from a banded white to bluish white and brownish yellows. Banded, moss, and plume agates occur.	California
Plaster City Petrified Wood					California, Baja California
Plympton Chert				Ranges from a light milky gray to dark gray weathering brown.	Nevada, Utah	Plympton Formation
Pogonip Chert				Light gray	Nevada	Pogonip Formation (group)
Pope Creek Jasper AKA: Pope Creek Poppy Jasper				Pope Creek Jasper is green with white and yellow "stringers" and orbs.	California	Knoxville Formation
Potter Valley Jasper				Red	California
Prase Chert				Greenish gray color	California
Prospect Mountain Quartzite				Brownish white, darker and more ferrous towards the base and lighter towards the top of the formation.	Nevada, Utah	Prospect Mountain Formation
Providence Petrified Wood				Petrified Sequoia wood occurring in volcanic ash.	California
Puerto el Parral Obsidian				Black	Baja California
Pumpernickel Argillite				Ranges from a dark red to green	Nevada	Pumpernickel Formation
Pumpernickel Chert				Ranges from a reddish gray to brown or black	Nevada	Pumpernickel Formation
Queen Valley Obsidian AKA: Fish Lake Valley Obsidian				Black	California, Nevada
Railroad Point Obsidian / Vitropyre				Black	Nevada
Rainbow Gardens Chert				Ranges from a dark green to black and white.	Nevada, Arizona	Rainbow Gardens Member of the Horse Spring Formation
Rainbow Mine Obsidian				Black with a pink translucence with a reddish orange cortex.	California
Ransburg Fossilized Palm Root				Gray chalcedony matrix with large irregular eye-like structures and fibers present.	California
Red Canyon Agate / Jasper / Petrified Wood				Includes moss and picture agate.	California
Red Switchback Obsidian				Colors of black and reddish brown or red.	California
Redland Chert				White	California	Redland Limestone Formation
Reed Argillite / Chert AKA: Reed and Benson Argillite / Chert				Light yellow cherty argillite	Utah	Reed Formation
Rex Chert				Ranges from a brownish red to purple or an ashy gray to black	Utah, Wyoming, Idaho, Nevada	Rex Chert Member, Phosphoria Limestone Formation
Rhyolite				Gray to grayish black, flow banding may be present alternating from light to darker gray	North America	Volcanic Activity
Riepe Springs Chert				Ranges from a brown to an olive gray or pink.	Nevada	Riepe Spring Limestone Formation
Road Creek Agate				A matrix that ranges from ranges in color from white to gray and bluish gray. Sagenite inclusions, aragonitte fans and calcite pseudomorphs may occur.	Idaho
Robbers Mountain Argillite / Chert				Ranges from a pale pink to pale purplish res, pale yellowish brown, or light gray with red and brown staining by iron oxide.	California	Robbers Mountain Formation
Roberts Mountains Chert				Light brown	Nevada	Roberts Mountains Formation
Sacramento Mountains Palm Root					California
Sam Springs Chert AKA: Clipper Canyon Chert				Varicolored chert.	Nevada	Sam Springs Formation of the Clipper Canyon Group
San Felipe Obsidian				Black	Baja California
Santa Cruz Island Chert				Ranges in color from white to gray or a light blond to a dark brown and occasionally bluish in cast.	California
Sapphirine Chalcedony				Ranges from a sky blue to a deep blue color with a grape like cluster surface.	California
Sausalito Chert				Primarily a brownish red color, but yellow, green, and other colors do occur.	California	Sausalito Chert Formation of the Franciscan Group
Schadler Ditch Obsidian AKA: Eightmile Creek Obsidian				Black	California
Scott Canyon Radiolarian Chert				Ranges from black to gray or a milky grayish brown, brecciation and recrystallization may be present	Nevada	Scotts Canyon Formation
Septaria AKA: Oderville Agate				Outer edge of a dark brownish gray with an interior of a lighter brown and white.	Utah
Sevy Chert / Dolomite				Homogenous and ranges from a light or dark gray to an olive gray or pinkish or orangish gray.	Nevada	Sevy Dolomite Formation
Sheep Spring Moss Agate				White to light blue matrix with black dendritic inclusions.	California
Siam Agate				Lumpy yellowish brown to pink chalcedony with clear to light blue banded agate stringers. Jasper also occurs.	California
Silicified Dinosaur Bone					Colorado, Nevada, Wyoming, Utah
Silverpeak Obsidian				Black	Nevada
Slaven Chert AKA: Slaven Radiolarian Chert,				Ranges from a brown to a grayish green color.	Nevada	Slaven Chert Formation
Sonoma Opal				Colors of peach, pink, and yellow.	California
Sonora Pass Agate				Agate breccia or banded agate	California, Nevada
South Hanging Rock Obsidian				Emerald Green	Nevada
Spor Mountain Jasper				Colors of yellow, orange, and gray with dendritic inclusions.	Utah
Spring Mountain Jasper				Colors of brown, yellowish brown, blue and green and commonly has scenic patterns or color illustrations.	Idaho
Springtime Jasper AKA: Lahontanite				Brecciated jasper with colors of pale blues to pale greens, reds, yellow, and purples with medium green veins commonly present.	Nevada
Squaw Butte Obsidian				Black	Oregon
St. John Jasper				Variegated jasper with colors of red, pink, white, and black.	Utah
Steamboat Hot Springs Sinter				Gray	Nevada
Stirling Quartzite / Jasper				Ranges from pink to gray with veins of white quartz and nodules of red jasper.	Nevada
Stone Canyon Jasper				Brecciated with angular pieces of yellow, tan, or brown cemented by contrasting transparent chalcedony of white, blue, purple, or black..	California
Stonewall Pass Agatized Wood				Colors of brown, black, white, yellow, orange, and red with wood grain or rings present.	Nevada
Stoney Creek Jasper				Colors of greenish yellow, red, and translucent chalcedony. Orbs or "poppies" my be present.	California
Stonyford Jasper Agate				Colors of greenish yellow, red, and translucent chalcedony.	California
Straw Beds Agate				Nodules or "thunder eggs" with a brownish exterior and a blue to black chalcedony interior.	California
Succor Creek Agate				Transparent white to bluish white matrix with darker colors of red, brown and black occurring towards the exterior.	Oregon, Idaho
Succor Creek Jasper AKA: Qwyhee Jasper				Scenic jasper with colors of tan, brown and blue	Oregon, Idaho
Sugar Hill Obsidian AKA: Sugar Hill Switchback Obsidian				Only black occurs	California
Sump Petrified Wood				Wood has shades of brown and white. Limb casts are also present. Sump Jasper is red and green.	Nevada	Esmeralda Formation
Surveyor Springs Obsidian AKA: Rock Creek, Twelvemile Canyon Obsidian				Black and a pinkish black.	Oregon, Nevada, California
Sutro Springs Obsidian AKA: Asshole Mountain, Double Springs, Flowery Range Obsidian				Black	Nevada
Swan Peak Quartzite				Ranges from white to gray	Utah, Idaho, Nevada	Swan Peak Formation
Swarbrick Chert				Gray (banded ?)	Nevada	Swarbrick Limestone Formation
Taylorsville Chert				Layers of black chert and masses of red chert	California	Taylorsville Formation
Tempiute Mountain Obsidian AKA: Butte Valley, Tempiute Range Obsidian				Black	Nevada
Texas Springs Agate / Chalcedony/ Petrified Wood AKA: Jackpot Chalcedony				Primarily pink and white casts of roots rather than limbs.	Nevada	Jarbridge Rhyolite Formation
Tick Canyon Agate / Bloodstone				Agate includes a bluish chalcedony	California
Tick Canyon Jasper				Jasper includes green jasper and brecciated jasper.	California
Tinajas Obsidian				Black	Baja California
Tintic Quartzite				Primarily white weathering a brownish red	Utah	Tintic Formation
Tomera Chert				Ranges from a gray to a grayish brown or green or red.	Nevada	Tomera Formation
Topache Chert				Light bluish color	Utah	Topache Limestone Formation
Topaz Mountain Obsidian AKA: Thomas Range Obsidian				Black	Utah
Toquima Chert / Jaspalite				Ranges from dark brown to gray and jaspalite is black	Nevada	Toquima Limestone Formation
Torrey Agate / Jasper / Petrified Wood				Petrified wood has shades of tan and gray with wood grain and rings commonly present.	Utah
Tosawihi Chert AKA: Toshawee Chert, Tosiwhu Chert, Ivanhoe Chert				White	Nevada	Tosawihi Member
Trinity Obsidian				Black with minor inclusions. Phenocysts may appear elongated with banding common.	California	Sonoma Volcanics
Truckee River Basalt AKA: Boca Reservoir, Martis Creek Basalt				Ranges from dark gray to black	California, Nevada
Truman Meadows Obsidian AKA: Truman Canyon Obsidian				Ranges from a clear to black with reddish brown streaking (mahogany obsidian) to banded black.	California, Nevada
Tuff AKA: Solidified Volcanic Ash				Contains greater than 75 volcanic ash and ranges from white to tan, gray or pink.	North America	Volcanic activity
Tuledad Agate				Multi-colored agate with colors of green, cream, white, brown, and red ranging to a flame agate.	California
Tuscarora Petrified Wood				Colors of light cream to tan or brown with red and orange shades. Wood grain or rings are commonly present.	Nevada
Tuqan Monterey Chert				Dark banded or mottled with colors of black, brown, and various shades of gray with buff or tan occurring less often. The cortex ranges from white or buff.	California	Monterey Formation
Tuscan Obsidian (Paradise Ridge) AKA: Paynes Creek, Inks Creek Obsidian				Black	California
Upper Ross Creek Obsidian				Black with a pink translucence	California
Utah Wonderstone				Banded rhyolite with banded colors of maroon, yellow, and white.	Utah
Valle del Azufre Obsidian				Black	Baja California
Van Duzer Chert				Ranges from a light gray to a dark gray or black.	Nevada, Idaho	Van Duzer Limestone Formation
Valmy Chert				Ranges from gray to green or black.	Nevada	Valmy Formation
Vinini Chert				Ranges from a very pale green to tan, gray, or black	Nevada	Vinni Formation
Virgin Valley Opalized / Petrified Wood				Opalized wood is primarily white with shades of blue, green, and red occurring. Petrified wood is shades of brown.	Nevada
Wall Canyon Jasper				Pink laced jasper.	California
Wall Street Jasper				Colors of red yellow and brown, rarely a greenish yellow.	California
Wedge Butte Obsidian				Black, commonly with pyroclastic inclusions (snowflake obsidian)	Idaho
Wendover Moss Agate				White to bluish matrix with red or yellow dendritic inclusions.	Nevada, Utah
White Mountain Obsidian				Black	Utah
Willow Creek Jasper				Colors of purple, pink and green with clear or white veins.	Idaho
Wildcat Hills Obsidian				Black with phenocysts inclusions present.	Utah
Wiley Well Agate				Includes Moss, Plume, Lace, and banded agates with colors of red, brown, tan, clear, and black.	California
Windfall Chert				Primarily a light to dark gray and may range from homogenous to banded or stripped with light and darker grays. Brown, green, and white also occurs.	Nevada	Windfall Formation
Woodman Chert				Ranges from a dark gray to black	Utah	Woodman Formation
Woodruff Chert				Ranges from a laminated brown to black chert	Nevada	Woodruff Formation
Woodruff Porcelanite				Ranges from white to a pale green..	Nevada	Woodruff Formation
Yellowjacket Obsidian				Gray / black banded obsidian with clear streaking	California
Young Peak Chert				Dark gray	Utah	Young Peak Dolomite Formation