Desert Southwest Region Lithic Material

Materials Identification Guide

Desert Southwest Region Lithic Material

Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated Formation / Member
Abique Agate				Colors of whites, grays, reds, yellows, oranges, and browns	New Mexico, Arizona
Abiquiu Jasper					New Mexico
Abiquiu Moss Agate				White to light gray matrix with inclusions of red, black, and yellow.	New Mexico
Abiquiu Quartzite				Ranges from a white to a whitish gray or whitish brown.	New Mexico
Abo Sandstone				Laminated sandstone that ranges from a tan to a dark red or purple	New Mexico, Texas, Chihuahua	Abo Sandstone Formation
Acebuche Agate					Chihuahua
Agate Jasper (Generic Type)				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
Agua Fria Obsidian				Ranges from black to a brownish black with banding occasionally occurring..	Sonora, Chihuahua
Agua Nueva Agate				Primarily pink or white with vivid shades of blue and green.	Chihuahua
Agua Prieta Agate				Colors of orange, yellow, and red	Sonora, Arizona
Aldama Agate				Colors of white, blue, red and maroon.	Chihuahua
Aleman Ribbon Chert				Ranges from a dark gray to white or red. Chalcedony occurs as veins, bird eye like vugs, and fossil replacement.	Texas, New Mexico	Aleman Member of the Montoya Formation
Alibates Agatized Dolomite AKA: Alibates Flint				Primarily banded, speckles, or mottled with colors commonly ranging from red, blue, purple, brown, cream, and white.	Texas, Oklahoma, New Mexico, Colorado, Kansas	Quartermaster Formation
Allamoore Ribbon Chert					Texas, Chihuahua	Allamoore Formation
American Nettie Quartzite Dakota Quartzite variant					Colorado	American Nettie Member of the Dakota Quartzite Formation
Andesite Generic Type					North America	Varies
Antelope Creek Obsidian (east)				Ranges from an opaque black to a translucent smoky gray with gray banding. Brown and black mahogany also occurs.	New Mexico	Mule Mountain Volcanics
Antelope Creek Obsidian (west)				Ranges from an opaque black to a translucent smoky gray with gray banding. Brown and black mahogany also occurs.	New Mexico	Mule Mountain Volcanics
Antelope Wells Obsidian AKA: El Berrendo Obsidian				Ranges from a translucent greenish brown to a dark gray with greenish brown banding or an opaque black.	New Mexico, Chihuahua
Antique Pink Agate AKA: Bubblegum				Pink color.	New Mexico, Arizona
Apache Agate				Colors of red, orange, or yellow.	Chihuahua
Apache Creek Agate				Most commonly a white and grayish blue fortification or onyx banded agate or tube agate, rarely black and white moss agate occurs.	New Mexico
Apache Jasper				Colors of reds, browns, muted oranges, browns, tans, and cream.	New Mexico
Aparejos Agate				Colors of yellows, whites, and muted orange.	Chihuahua
Apple Ranch Chert				Brown	Texas	Apple Ranch Limestone Member of the Word Formation
Argillite (Generic type)				Light to dark green, but may range to various shades of gray	North America
Arroyo Penasco Chert AKA: Tecolote Creek Chert				Ranges from black in the lower portions of the formation to white in the upper portions of the formation.	New Mexico, Colorado	Arroyo Penasco Formation
Baldy Hill Jasper AKA: Cimarron River Jasper				Mottled color from most commonly varying shades of reds and yellows.	New Mexico, Colorado, Kansas, Oklahoma	Baldy Hill Formation
Balmorhea Blue Agate AKA: Toyah Agate				Ranges from a light blue gray to a dark blue gray, lavender, and white with bands of slight gray to lighter blues.	Texas, New Mexico
Basalt (Generic Type)				Ranges from black to gray	Western North America
Beartooth Quartzite				White and black	New Mexico	Beartooth Quartz Formation
Bear Springs Obsidian AKA: See page for list				Black with clear banding	New Mexico	Valles Volcanics, Canavas Rhyolite Formation
Big Bend Moss Agate AKA: Big Bend Plume Agate				Matrix that ranges from white to a clear blue or carnelian with brown green, red, or orange plumes or dendritic inclusions.	Texas, Coahuila, Chihuahua
Big Bend Petrified Wood				Shades of brown with wood grain and rings present.	Texas, Coahuila, Chihuahua
Big Bend Yellow Jasper				Commonly a mottled yellow with reds occurring.	Texas, Coahuila, Chihuahua
Big River Rainbow Jasper				Multi-colored banded jasper	Arizona
Birds of Paradise Agate				Clear to bluish matrix with plumes and veils of red, yellow, and orange.	Chihuahua
Bisbee Turquoise				Medium blue with chocolate brown mottling and black dendritic inclusions.	Arizona
Black Tank Obsidian AKA: Rose Well Obsidian				Occurs as black nodules and black and red mahogany obsidian nodules..	Arizona	Mount Floyd Volcanics
Blanco Basin Mudstone				Primarily a reddish brown, but may range to red, maroon, purple green or gray, mottling may be present	Colorado, New Mexico	Blanco Basin Formation
Bloody Basin Agate				Clear matrix with plumes or inclusions of red and yellow.	Arizona
Blue Agate				Vivid blue	Chihuahua
Blue Agate Geodes				Bluish gray chalcedony cortex with a deeper blue interior.	Chihuahua
Blue Bird Turquoise				Dark to medium blue blue color in a white quartz and black and yellow / brown matrix.	Arizona
Bolsa Quartzite AKA: Bolza Quartzite (Sonora), Dragoon Quartzite				Dark brownish color with lighter bands	Arizona, Sonora	Bolsa Quartzite Formation
Bouse Jasper				Primarily a botryoidal jasper with colors of yellow, orange, and red.	Arizona
Brenda Jasper / Moss Agate				Ranges from a orbicular jasper to a jasper agate with colors of rich cherry red to yellow and purple.	Arizona
Brushy Basin Chert				Banded, white in color with pastel shades of tan, pink, green, and orange with banded or swirls of darker shades of brown, reddish brown, or gray.	Colorado, Utah, Arizona, New Mexico	Brushy Basin Member, Morrison Formation
Brushy Basin Quartzite					Colorado, Utah, Arizona, New Mexico	Brushy Basin Member, Morrison Formation
Bug-eyed Agate				Colors of clear, white, green, blue, and pink. Eyes. tubes, dendrites and fortifications are present.	Texas, Chihuahua
Bull Canyon Agate (plume and moss)				Course dendritic inclusions and plumes of red, yellow, and green in a clear matrix.	Arizona
Bull Creek Obsidian				Black with few to absent phenocysts and black banding occasionally present.	Arizona	Kaiser Spring Volcanics
Burro Creek Agate				Matrix ranging from a light purple to blue or white with dendritic inclusions of brown and yellow.	Arizona
Burro Creek Jasper				Multi-colored dendritic jasper with background of white to tan with shades of pink, red, and yellow.	Arizona
Burro Creek Obsidian				Ranges from most commonly an opaque brownish gray to a less common translucent cloudy brown.	Arizona	Kaiser Spring Volcanics
Burro Creek Sagenitic Agate				Primarily a red vein agate with needles of white and yellow..	Arizona
Burro Mesa Chert				Colors from whites to grays, grays to blue, pinks and reds, and tan to yellow. It can be solid, mottles, or banded.	Texas, Chihuahua, Coahuila
Butterscotch Chert				Ranges from a light brown to a dark yellowish brown.	Texas
Caballos Novaculite AKA: Santiago Chert				Primarily white. However, the upper and middle layers range from a banded multi color white, light green, light red, and light browns.	Texas	Caballos Novaculite Formation
Canutillo Chert AKA: Texas Oil Chert				Ranges from a mottled light brown to dark brown or black.	Texas, New Mexico, Chihuahua	Canutillo Limestone Formation
Carnelian (Generic Type)				Translucent and varies in shades from reddish brown to reddish orange.	North America	Varies
Carneros Agate				Banded and plume agate.	Chihuahua
Casa Grande Agate				Ranges from gray to purple with sagenitic or psudomorphic inclusions.	Chihuahua
Castle Dome Turquoise AKA: Pinto Valley Turquoise				Ranges from a baby blue to green	Arizona
Cathedral Agate				Clear matrix with golden, purple, or red inclusions	Chihuahua
Cave Creek Jasper				Mottled reddish or yellowish color	Arizona
Cedar Mesa Chert				Red and white.	Arizona, Utah	Cedar Mesa Sandstone Member of the Cutler Formation
Cerritos Turquoise				Mottled and ranges in colors from a tan to a tannish green, yellow to yellowish green, blue to bluish green.	New Mexico
Cerro del Medio Obsidian AKA: Cerro Abrigo, Cerro Rubio, Cerro de los Poso Obsidian				Granular black with brown and black mahogany obsidian	New Mexico	Valles Volcanics, Valles Rhyolite Formation
Cerros del Rio Dacite				ranges from a very dark gray to black with spare olivine phenocrysts and very small when present.	New Mexico	Cerro del Rio Volcanics
Cienega Brown Chert				Ranges from a cream or tan to a yellowish or orangish brown.	Texas, Chihuahua
Charma Jasper				Mottled mustard yellow with intrusions of white quartz.	Colorado, New Mexico
China Chert				White	New Mexico
Chuska Mountain Chert AKA: Washington Pass, Narbona Pass, Paleo Pink Chert				Ranges from shades of pink to reddish orange, but can occur in banded gray, pink, and blue or banded gray and cream.	New Mexico, Arizona
Cimarron Jasper				Bright red, pale yellow, and yellowish brown with streaks of agate.	New Mexico
Clay Point Agate / Moss Agate				Colors of red and purple ranging from homogenous to mottled. Moss agate has black or brown dendritic inclusions.	Utah
Clifton Fire Agate				Purple color	Arizona
Coronado Quartzite				Ranges from brown to pink or maroon	Arizona	Coronado Quartzite Formation
Cottonwood Wash Chert				Banded	Utah
Cow Canyon Obsidian				Brownish green with thin banding occasionally occurring. The cortex is a grayish black.	Arizona	Mogollom - Datil Volcanics
Coyamito Agate				Colors of yellow, red, and pink with inclusions of needles, tubes, and crystal pseudomorhs.	Chihuahua	Rancho el Agate Andesite Formation
Cuesta Fire Agate					Arizona
Cumbres Pass Chert				Ranges in color from an opaque mottled white gray to tan. Chalcedony inclusions are throughout the chert matrix.	Colorado, New Mexico	San Juan Volcanics
Dacite Generic Type				Most commonly a light to dark gray or black	Western North America	Varies
Dakota Quartzite AKA: Dakota Orthoquartzite				Ranges in color from reds to browns	Colorado, South Dakota, Nebraska, Kansas, Texas, New Mexico	Dakota Formation
Deadmans Mesa Obsidian				Two varieties, the first one is a granular dark gray with brick red flow present, second ranges from a granular dark gray to black.	Arizona	San Francisco Volcanics
Deer Creek Fire Agate				Ranges from colors of reds, yellows, greens, and blues.	Arizona
Del Norte Plume Agate AKA: Embargo Plume Agate				Banded clear matrix with golden or orangish yellow plumes.	Colorado
Deming Moss Agate				Ranges from red to yellow with black or brown dendritic inclusions	New Mexico
Devil's River Chert AKA: Santa Elena Cahert				Ranges from a light gray to light brown and may be brecciated.	Texas, Coahuila	Devils River Limestone Formation
Dimple Hills Chert				Black	Texas	Dimple Hills Limestone Formation
Dripping Springs Quartzite				Purplish in color	Arizona	Dripping Springs Quartzite Formation
Duncan Obsidian				Smoky gray	Arizona	Ash Peak Volcanics
Edwards Plateau Chert				Ranges in color from most commonly light gray to brown or a medium gray. May have numerous short linear fossil inclusions.	Texas, Coahuila	Edwards Limestone Formation
Ejido Siquirichi Obsidian				Black	Chihuahua
Ellenburger Chert				Ranges from white to a light yellow or light gray.	Texas	Ellenburger Limestone Formation
El Paso Chert				Ranges from a medium light gray to olive gray dolomite to a light tan to gray or olive gray with reddish or bluish streaks occasionally present.	Texas, New Mexico, Chihuahua	El Paso Limestone Formation
Enchantment Turquoise				Ranges from a deep green to a deep blue in a tan or golden brown matrix.	New Mexico
Escabrosa Chert				Ranges from a light to dark gray.	Arizona, Sonora	Keating Member of the Escabrosa Limestone Formation
Escudilla Agate / Carnelian AKA: Escudillo Agate				Banded or mottled with colors of blue, gray, and black.	New Mexico, Arizona
Etholen Chert				Ranges from gray to a light pinkish gray, black, or dark purple with darker colors being the most common.	Texas	Etholen Conglomerate Formation
Felsite (Generic Type)				Generally white to light gray or reddish or tan with darker speckles being present.	Texas
Fort Pena Chert				Ranges from shades of purple, red, and blue	Texas	Fort Pena Formation
Fusselman Dolomite / Chert				Ranges from a light gray to an olive gray or brownish gray.	New Mexico, Texas, Chihuahua	Fusselman Dolomite Formation
Government Mountain Obsidian				Ranges from a lighter gray to cloudy gray or black with microphenocrysts of feldspar and iron oxide are present.	Arizona	San Francisco Volcanics
Grants Ridge Obsidian AKA: Taylor Mountain Obsidian				Black with small gray inclusions sometimes present	New Mexico	Mount Taylor Volcanics
Gwynn and Ewe Canyon Obsidian				Ranges from an opaque black to a transparent brown with a black water worn cortex.	New Mexico	Feathery Hill Volcanics
Hachita Turquoise				Ranges from a bluish green to blue with a golden tan to brown matrix.	New Mexico
Hermosa Chert				Has colors of red, gray and jet black.	Utah	Hermosa Formation
Hidden Canyon Jasper					Arizona	Wescogame Formation
High Lonesome Turquoise				Ranges from a green to powder blue	New Mexico
Horace Mesa Obsidian AKA: Taylor Mountain Obsidian				Black with small gray inclusions sometimes present	New Mexico	Mount Taylor Volcanics
Huepac Chert AKA: Tarahumara Chert				Banded gray and black	Sonora	Tarahumara Formation
Ithaca Peak Turquoise				Medium blue with mottling of black and golden or yellow and silver (pyrite) inclusions.	Arizona
Jemez Jasper				Colors of ivory, yellow, tan brown, and chocolate. May be homogenous, multi colored onyx banded, or scenic jasper.	New Mexico
Johnny Bull Turquoise				Ranges from a light blue to a medium blue in a brownish matrix..	New Mexico
Jornada Opalized Wood / Agate				Opalized wood and agate of salmon with alternating bands of white, plume and moss agate, and chalcedony.	New Mexico
Kiabab Chert				Mottled with whites, light browns, tans, and light grays with a brown cortex	Arizona, Utah, Nevada	Kiabab Limestone Formation
Kendrick Peak Obsidian				Ranges from a grayish black to black with abundant phenocrysyst thin flakes show the common San Francisco Volcanics cloudy gray color.	Arizona	San Francisco Volcanics
Kingman Turquoise				Medium blue with yellow, golden, browns, and black mottling.	Arizona
King Mine Turquoise AKA: Manassa Turquoise				Ranges from a pale blue to a strong sky blue or bluish green to green with golden and brown color mottling and veinlets and irregular masses.	Colorado
La Bajada Hill Agate					New Mexico
Lago Barreal Obsidian				Ranges from a smoky gray to brown.	Chihuahua
La Jara Mesa Obsidian				Black	New Mexico	Mount Taylor Volcanics
Lake Valley Chert				Ranges from a light gray to a light bluish gray.	New Mexico	Tierra Blanca Member of the Lake Valley Limestone Formation
Leonard Chert				Yellowish	Texas	Leonard Formation
Little Egypt Agate				Shades of red	Utah
Los Jagueyes Obsidian				Black	Chihuahua
Los Sitios del Agua Obsidian AKA: AZ Unknown A, Kate's Green Obsidian				Ranges from a light gray to black a jade green also occurring.	Sonora, Arizona	Sierra Panacate Volcanics
Los Vidrios Obsidian				Homogenous opaque black with no banding or lighter shades. The cortex ranges from a brown to gray.	Sonora, Arizona	Sierra Pinacate Volcanics
Madera Chert				Ranges from a gray to a pale blue. Colors of red, orange, white and yellow may also occur	New Mexico	Medera Limestone Formation
Maravillas Chert AKA: Maravillas Gap Chert, Canyon Chert				Ranges from a dark gray to black, fine white chalcedony veins or fine pale green banding may be present.	Texas, Chihuahua, Coahuila	Maravillas Formation
Marfa Plume Agate				Transparent to translucent matrix with dense black, metallic yellow, and less frequently, white plumes.	Texas
Mazatzal Argillite				Ranges from an orange to orangish red with tan inclusions	Arizona	Mazatzal Quartzite Formation
Mazatzal Quartzite				Ranges from light brown to gray	Arizona	Mazatzal Quartzite Formation
McGaffrey Ridge Chert				Medium brownish gray.	New Mexico
McKnight Chert				Ranges from a dark gray to black.	Texas	McKnight Formation of the Atascosa Group
Moab Agate / Chalcedony				Includes white agate and red agate with red fortifications, Chalcedony is bluish white.	Utah
Moab Jasper				Brownish yellow and red	Utah
Moab Petrified Wood				Shades of brown and black with wood grain and rings present.	Utah	Cutler Formation
Mockingbird Gap Agate					New Mexico
Montoya Chert				Shades of pink	New Mexico, Texas, Chihuahua	Montoya Formation
Morenci Turquoise				Ranges from a dark to light blue. splotches of silver or gray occurs as a breccia. Quartz inclusions may be present.	Arizona
Morrison Chert AKA: Brushy Basin Chert / Burro Canyon Chert				Commonly mottled and ranges in shaded of maroon, green, tan, and brown.	Colorado, Utah, New Mexico	Burro Canyon Formation / Brushy Basin Member, Morrison Formation
Morrison Mudstone				Commonly mottled and ranges in shaded of maroon, green, tan, and brown.	Colorado, Utah, New Mexico	Burro Canyon Formation / Brushy Basin Member, Morrison Formation
Morrison Petrified Wood				Colors of red, yellow, purple, black, gray, brown, and white. Wood grain and rings are commonly present.	Utah, Colorado, New Mexico	Morrison Formation
Morrison Silicified Sandstone				Commonly mottled and ranges in shaded of maroon, green, tan, and brown.	Colorado, Utah, New Mexico	Brushy Basin Member of the Morrison Formation
Morrison Quartzite				Ranges from a tan to brown or purple to maroon or gray.	Colorado, Wyoming, New Mexico, Utah	Morrison and Cloverly Formation
Mosca Chert				Mottled and ranges in color from shades of pink to burgundy, yellow to brown, and white.	New Mexico	Leadville Limestone Formation
Mule Mountain Obsidian				Ranges from an opaque black to a translucent smoky gray with gray banding. Brown and black mahogany also occurs.	New Mexico	Mule Mountain Volcanics
Mushroom Jasper				Colors of most commonly grays with greens, reds, and yellows also occurring. The outer cortex is rhyolite	Arizona
Nakaye Chert				Weathers brown	New Mexico	Nakaye Formation
Nazlini Petrified Wood				Shades of browns, yellows, reds, orange, and white with wood rings or grain present.	Arizona
Needle Peak Agate				Mottled whitish tan to a light brown or dark yellowish brown, fortified agate, moss agate and pom pom agate also occurs.	Texas
New River Jasper					Arizona
Newman Dome Dacite				Ranges from a dark gray to black with rare aphyric and sanidine phenocrysts, and very small when present.	New Mexico	Taos Plateau Volcanics
No Aqua Obsidian - North AKA: John Manville Mine Obsidian				Black	New Mexico	Taos Plateau Volcanics
No Aqua Obsidian - West Hill AKA: Grefco Mine Obsidian				Black	New Mexico	Taos Plateau Volcanics
Novaculite AKA: Arkansas Novaculite, Ouachita Novaculite (Generic Type)				Range from white to light gray or black	Texas, Coahuila, Arkansas, Oklahoma	Varies
Nugget Sandstone				Ranges from buff to pink	Utah, Arizona, Nevada	Chug Water Formation
Nutt Agate				Plum to red and black splashed agate.	New Mexico
Nutt Mountain Obsidian				Black	New Mexico
Obsidian AKA: Volcanic Glass (Generic type)				Black to black with bands of dark reds (mahogany obsidian) or white flakes (snowflake obsidian)	Western North America	Volcanic
Obsidian Ridge Obsidian AKA: see list				Brown with sulferetic inclusions.	New Mexico	Valles Volcanics, Cerro Toledo Rhyolite Formation
Ojo Frederico Obsidian				Black	Chihuahua
Old Paria Petrified Wood AKA: Paria Petrified Wood				Shades of gray, brown, black, white, and pink with wood grain and rings present.	Utah, Arizona
O'Leary Peak Obsidian AKA: Robinson Crater Obsidian				Glassy grayish black highly vitrophyric rhyodacite with abundant phenocrysts. .	Arizona	San Francisco Volcanics
Opalized Caliche				Colors of brown, pink, and white.	New Mexico	Opalized Caliche Group
Owl Rock Chert					Arizona, Utah, New Mexico	Owl Rock Member of the Chinle Formation
Paliza Obsidian AKA: Bearhead Obsidian				Black	New Mexico	Valles Volcanics, Bearhead Rhyolite Formation
Paradise Chert				Translucent white matrix with mottling of opaque cream to yellow or brown opaque patches.	Utah
Partridge Creek Obsidian AKA: Round Mountain Obsidian				Black with cloudy gray banding infrequently occurring. Cortex varies from a thin grayish black to a brownish black	Arizona	Mount Floyd Volcanics
Pedernal Chert (agate) AKA: Cerro Pedernal Agate / Chalcedony				Ranges from a white to pearly gray with a black banding to a translucent yellow, pink, and red with spots of white or pearly gray.	New Mexico	Pedernal Chert Member of the Abiquiu Tuff Formation
Perkinsville Agate				Multi-colored with shades of pink, yellow, red, purple, and white.	Arizona
Petrified Wood AKA: Agatized Wood, Opalized Wood				Vary in color based on the minerals present during the process	North America	Varies
Plomosa Mountain Jasper				Colors of orange, red, and green. Jasper agate also occurs.	Arizona
Polvadera Peak Obsidian AKA: El Rechuelos Obsidian				Fine black color with volcanic ash partial present.	New Mexico	Valles Volcanics, El Rechuelos Rhyolite Formation
Pom Pom Agate				Soft green to colorless matrix with clear yellow "pom pom" inclusions.	Texas
Poncha Pass Agate / Jasper				Blue agate	Colorado
Presley Wash Obsidian				Occurs in two variations. The first is a glassy gray to black and the second is a sub-vitreous rhyolitic gray to grayish green or black.	Arizona	Mount Floyd Volcanics
Pueblo Quartzite				Most commonly yellow, but becomes red and purplish gray towards the southern end of the outcroppings.	New Mexico	Pueblo Quartzite Formation
Purple Passion Agate				Shades of lavender with a rhyolite cortex.	Arizona
Rabbit Ranch Agate				Black	Arizona
Rainbow Gardens Chert				Ranges from a dark green to black and white.	Arizona	Rainbow Gardens Member of the Horse Spring Formation
Rancheria Chert				Porous ranging from gray to brown and weathering brown	New Mexico, Texas, Chihuahua	Rancheria Formation
Red Hill Obsidian				Ranges from a transparent brown to a cloudy or banded light gray.	New Mexico	Mogollon - Datil Volcanics
Redwall Chert				Red	Arizona	Redwall Limestone Formation
Rhyolite (Generic Type)				Gray to grayish black, flow banding may be present alternating from light to darker gray	North America	Volcanic Activity
Rio Grande River Chert				Wide variety of colors with the most common being shades of cream, tan, and brown. Petrified wood and quartzite also occur	Texas, New Mexico, Coahuila, Chihuahua,	Rio Grande river gravels.
Rio Grande Valley Wood				Shades of white, gray, brown, red, and black with wood rings and grain present.	Texas	Goliad Formation
Round Mountain Fire Agate				Shades of brown and white	Arizona
RS Hill Obsidian				Ranges from a dark gray to black with infrequent feldspar phenocrysts..	Arizona	San Francisco Volcanics
Saddle Mountain Agate / Carnelian, Petrified Wood				Brown and white banded agate with red and clear marking present. Fire agate also occurs.	Arizona
Safford Fire Agate				Shades of white and brown.	Arizona
Salmon Peak Chert					Texas, Coahuila	Salmon Peak Formation
San Andres Chert AKA: Fingerprint Chert				White to light gay with fine gray banding. A fossiliferous medium gray also occurs.	New Mexico	San Andres Limestone Formation
San Antonio Mountain Dacite				Dark gray to black with spare phenocrysts of alkali feldspar	New Mexico	Taos Plateau Volcanics
San Francisco Peak Obsidian (Fremont / Agassiz Saddle)				Grayish black and extremely vitrophyric with abundant feldspar phenocrysts and inter-banded with ash.	Arizona	San Francisco Volcanics
Sandia Chert				Ranges from a dark gray to a purplish dark gray or black.	New Mexico	Sandia Formation
Santa Rita Turquoise				Ranges from a blue to green with a golden brown matrix. Gold ore is commonly present in the matrix.	New Mexico
San Tank Obsidian				Black with few to absent phenocysts and black banding occasionally present..	Arizona	Sauceda Volcanics
Santiago Chert (Caballos Novaculite)				Banded with primarily green, but dull shades of red, gray, brown, yellow, and white are also present.	Texas	Santiago Chert Member of the Caballos Novaculite
Sawmill Creek Obsidian AKA: Mule Creek Obsidian				Ranges from an opaque black to a translucent smoky gray with gray banding. Brown and black mahogany also occurs.	New Mexico	Mule Mountain Volcanics
Selene Obsidian AKA: Unknown Sonora B				Black	Sonora
Sierra Fresnal East Obsidian				Black	Chihuahua
Sierra Fresnal West Obsidian				Black	Chihuahua
Sierra la Brena Obsidian				Black	Chihuahua
Shinrump Chert				Ranges from gray to white.	Utah, Arizona, New Mexico	Shinarump Conglomerate Member of the Chinle Formation
Shinarump Quartzite				Black and red	Utah, Arizona, New Mexico	Shinarump Conglomerate Member of the Chinle Formation
Sitgreaves Mountain Obsidian				Cloudy gray with banding or patterns commonly present. The cortex is a tan to brown.	Arizona	San Francisco Volcanics
Slate Mountain Obsidian AKA: Wallace Tank Obsidian				Composed of equally amounts of black nodules and black and red mahogany nodules..	Arizona	San Francisco Volcanics
Sleeping Beauty Turquoise				Light blue color.	Arizona
South Sauceda Mountains Obsidian				Ranges from greenish brown to a black. Green with black banded and light gray with black banding also occurs.	Arizona	Sauceda Volcanica
St. John's Flower Agate				Ranges from a white to blue matrix with dendritic plumes or flower inclusions of red, yellow, purple, brown or black.	Arizona
Superior Obsidian AKA: Picketpost Obsidian				Transparent brown with banding occurring.	Arizona
Summerville Chert				Two variations. One is black chert and the other is a white or red opalitic chert.	Utah, Arizona, New Mexico, Colorado	Summerville Formation
Tank Mountain Obsidian				Black with few to absent phenocysts and black banding occasionally present..	Arizona
Taylor Ranch Chert				Orangish brown color	Texas	Taylor Ranch Limestone Member of the Hess Formation
Tecovas Jasper AKA: Quitague Jasper				Ranges from variegated or mottled red, blue, purple, brown, cream, and white	Texas, New Mexico, Oklahoma	Tecovas Formation
Thistle Agate				Matrix of translucent gray or green with fine white or yellow starburst or pom poms.	Texas
Tomichi Chert				Mottled bluish gray color weathering brown.	Colorado	Tomichi Limestone Formation
Topaz Basin Obsidian				Transparent smoky gray with banding and clouding rare.	Arizona
Troy Quartzite				Ranges from unevenly colors of pink to green.	Arizona	Troy Quartzite Formation
Thunderbird Rhyolite				Ranges from a dark purplish gray or black with brownish red inclusions to a reddish brown with dark purplish gray or black inclusions.	New Mexico, Texas, Chihuahua	Thunderbird Formation
Tuff AKA: Solidified Volcanic Ash				Contains greater than 75 volcanic ash and ranges from white to tan, gray or pink.	North America	Volcanic activity
Turquoise Mountain Turquoise AKA: Birdseye Turquoise				Ranges from a light blue to a medium blue with black, brown, or yellowish brown mottling and darker blue circles	Arizona
Tyrone Turquoise				Medium blue with brown to yellowish brown mottling	New Mexico
Upper Rio Grande Jasper / Opal				Mottled yellow color with inclusions of varicolored opal.	Colorado
Valmont Dolomite / Chert				Ranges from a whitish gray to a dark medium gray	New Mexico	Valmont Dolomite Formation
Van Horn Purple & Tan Chert				Ranges from a mottled pale to medium purple or a mottled light to medium tan, purplish tan or grayish orange.	Texas
Van Horn Spotted Chert				Ranges from a brownish red to a grayish red, pale orange, or grayish purple with spots or patches of white, or reversed colors.	Texas
Van Horn White Chert				Ranges from a mottled white to medium light gray or pinkish gray.	Texas
Vidrio Chert				Uniform dark to light gray	Texas	Vidrio Massive Member of the Captain Limestone Formation
Vulture Obsidian				Greenish brown with banding or clouding occurring and rarely greenish and black banding present.	Arizona
Wagon Wheel Gap Carnelian				Clear and variegated	Colorado
Watahomigi Chert AKA: Supai Chert, Watahomigi Jasper				Shades of medium to dark red or purple and grays with white quartzite veins commonly present.	Arizona, Utah, Nevada	Watahomigi Formation of the Supai Group
Wolf Creek Pass Sagenitic Agate					Colorado	Treasure Island Rhyolite Formation
Woodruff Petrified Wood				Shades of red, orange, pink, yellow, tan, brown, and white with wood grain or rings present.	Arizona
Woodward Ranch Agate AKA: Alpine Agate				Includes both plume, flower, and banded agates with plumes of red and black and pink banded agate.	Texas
Wylie Mountain Agate AKA: Van Horn Butterscotch Agate				Ranges from a mottled whitish tan to a light brown or dark yellowish brown or a mottled whitish pink to a dusty red.	Texas
Yeso Chert				Ranges from gray to a grayish brown or brown, or ranges from shades of red to a mottled white or light gray and pink (see page)	New Mexico	Possibly the Yeso Formation
Zebra Stone AKA: Zebra Chert, Zebra Jasper				Ranges from black to brown with tan banding.	Arizona
Zuni Spotted Chert				Ranges from a golden yellow to brownish yellow matrix with darker brown inclusions.	New Mexico