Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated          Formation / Member
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 Nebraska
Argentine Chert				Ranges in color from a light tan to a pale to medium gray.  Light mottling or streaking may be present.	Eastern Nebraska	Argentine Member of the Wyandotte Limestone Formation
Bethany Falls Chert				Ranges from light to dark gray	Northeastern Nebraska	Swope Formation
Bijou Hills Quartzite AKA: Ogallala Orthoquartzite				Range from a dull gray white to a drab olive greenish color.  It typically has various minerals that can give a salt and pepper appearance	North central Nebraska	Ogallala Formation
Blue River Agate					Southeastern Nebraska	Eskridge Formation
Blue Springs Chert					Southeastern Nebraska
Chadron Chert				Mottled and ranges from tan or yellowish brown to red or gray.  Vugs filled with chalcedony or drusy quartz may be present.	Northern Nebraska	Chadron Formation
Cottonwood Chert AKA: Manhattan Chert				Grayish brown with patches of shades of white.	Southeastern Nebraska	Cottonwood Limestone Formation
Curzon Chert				Mottled and primary medium to light gray, but may range to a light yellow brown to a light olive brown or brownish gray.	Southeastern Nebraska	Curzon Limestone of the Topeka formation
Dakota Quartzite AKA: Dakota Orthoquartzite				Ranges in color from reds to browns	Western Nebraska	Dakota Formation
Dawson Petrified Wood AKA: Elizabethan, Parker, Cherry Creek Petrified Wood				Ranges from a yellowish tan with clear or white linear inclusions to a reddish tan with dark tan inclusions	Southwestern Nebraska	Dawson Formation
Deuel County Petrified Wood					Southwestern Nebraska	Oligocene Chadron Formation
Ervine Creek Chert				Ranges from a light medium gray to a dark gray.  Larger white specks are formed by fossils	Southeastern Nebraska	Ervine Creek Limestone Member, Deer Creek Limestone Formation
Fairburn Agate AKA: Tee Pee Canyon Agate, Guernsey Lake Agate				Alternating circular bands of fibrous chalcedony alternating between yellowish brown with a narrower whitish band	Northwestern Nebraska	Chadron Formation, White River Group
Flattop Butte Chalcedony AKA: Flattop Mesa Chalcedony				Ranges from opaque white to translucent lavender with specks of blue and pink.	Southwestern Nebraska	Chadron capstone
Hartville Chert AKA:Hartville Uplift Chert, Hartville Uplift Jasper				Ranges from most commonly colors and hues of yellow, orange, red, brown, and purple with black mottling and dendrites common	Western Nebraska	Hartville Formation
Hartville Quartzite AKA: Hartville Uplift Quartzite				Ranges from white to a light to medium gray, tan or red, white streaking may be present.	Western Nebraska	Hartville Formation
Kimball Chert				Ranges from tannish off white to tan or light brownish gray.  Commonly has dendritic inclusions.	Southwestern Nebraska	Ogallala Formation
Knife River Flint Knife River Chert, Knife River Chalcedony				Ranges in color from a root beer, tea, coffee, or caramel brown	Northeastern Nebraska	Eocene Golden Valley Formation
Minnekahta Chert				Medium brown with a red mesh of hematite and limonite and round quartz inclusions.	Northwestern Nebraska	Minnekahta Limestone Formation
Nehawka Chert Rice Grain Chert, Protozoa Agate, Weeping Water Chert				Ranges from grayish blue to blue with oolitic white specks	Southeastern Nebraska	Pennsylvanian Limestone Formation
Neva Chert				White	Southeastern Nebraska	Neva Limestone Member of the Grenola Formation
Ogallala Orthoquartzite AKA: Bijou Hills Silicified Sediment and Sugar Rock				Colors can vary, but most common colors are light to dark gray, tan, white, pink, maroon, or golden	Western Nebraska	Ogallala Formation
Ogallala Palm Wood AKA: Petrified Palmwood				Ranges from white to a dark gray with specks.	Western Nebraska	Ogallala Formation
Ogallala Silicified Sediment AKA: Ogallala Chert				Ranges from a buff to a reddish color or gray.  Quartz inclusions form speckles in the material.	Western Nebraska	Ogallala Formation
Opeche Chert AKA: Opeche Siltstone				Reddish color	Northwestern Nebraska	Opeche Formation
Pawnee Creek Gravel					East central Nebraska
Pawnee Grassland Quartzite				Ranges in color from a pinkish to a yellowish tan.	Southwestern Nebraska	Pawnee Creek Bed Formation
Petrified Wood AKA: Agatized Wood, Opalized Wood				Vary in color based on the minerals present during the process	Nebraska	Varies
Plattsburg Chert				Light brown color.	Southeastern Nebraska	Plattsburg Limestone Formation
Plattsmouth Fossiliferous Chert Rice Agate				Ranges from a medium to medium dark gray or brownish gray to black.  Light brownish fossils form specks.	Eastern Nebraska	Plattsmouth Member of the Oread Formation, Virgilian series, Shawnee Group
Prairie Agate				Concentric banding and is a marbled mixture of chalcedony and different colors of jasper	Northwestern Nebraska	Chadron Formation
Republican River Jasper AKA for Smoky Hills Jasper				Vary in color from a mustard brown or caramel brown to a chalky or creamy white, less commonly red, green, or black does occur, Inclusions and dendrites may be present	Central Nebraska	Smoky Hills Member of the Niobrara Chalk Formation
Rhyolite				Gray to grayish black, flow banding may be present alternating from light to darker gray	North America	Volcanic Activity
Schroyer Chert AKA: Wreford Type B				Ranges from bluish gray to a gray and may be mottled or splotched with darker gray with speckles of small white fossils	South central Nebraska	Schroyer Member, Wrenford Limestone Formation
Sheldon Chert				Translucent to opaque chert ranging from a light to dark gray or yellowish brown and pinkish brown.  Densely filled with fossil fragments	Southeastern Nebraska	Sheldon Member of the Topeka Formation, Shawnee Group
Sioux Jasper \AKA: Sioux Falls Jasper				Ranges in color from a brownish yellow to red	Eastern Nebraska	Sioux Formation
Sioux Quartzite AKA: Redstone Quartzite				Ranges from a light grayish tan to a medium grayish brown.	Eastern Nebraska	Sioux Formation
Smoky Hills Jasper AKA: Alma, Graham,  Niobrara, Republican River Jasper				Vary in color from a mustard brown or caramel brown to a chalky or creamy white, less commonly red, green, or black does occur, Inclusions and dendrites may be present	Central Nebraska	Smoky Hills Member of the Niobrara Chalk Formation
South Bend Chert				Ranges from a light gray to a light bluish gray, concretions are commonly present.	Southeastern Nebraska	South Bend Member of the Stanton Limestone Formation
Spanish Diggings Quartzite AKA: Fall River Quartzite and Lamoka Quartzite				Range from a medium to very light shades of brown, gray, and purple or purplish gray, may be homogenous to variegated or banded	Northwestern Nebraska	Fall River and Lamoka Formation of the Inyan Kara Group
Spearfish Chert				Ranges from a grayish red to purple	Northwestern Nebraska	Spearfish Limestone Formation
Spring Branch Chert				Primarily a medium gray chert with darker fossil inclusions.  Bluish gray chalcedony vugs may be present.	East central Nebraska	Spring Branch Limestone of the Lecompton Formation
Spring Hill Chert				Strongly mottled and ranges from light to dark gray with dark speckles being present.	Southeastern Nebraska	Spring Hill Member, Plattsburg Limestone Formation
Stoner Chert Type A and B				Ranges from light to medium gray or a grayish tan with white veins.	Southeastern Nebraska	Stoner Member of the Stanton Formation, Lansing Group
Tongue River Silicified Sediment AKA: Tongue River Silica				Grayish brown sediment, pseudoquartzite, or arenaceous chert	Northeastern Nebraska	Slope / Bullion Creek formation
Toronto Chert				Homogenous ranging from a white to a pale brown or yellowish brown.	Southeastern Nebraska	Toronto Limestone Member, Oread Formation of the Shawnee Group
Tuff AKA: Solidified Volcanic Ash				Contains greater than 75 volcanic ash and ranges from white to tan, gray or pink.	North America	Volcanic activity
White River Group Silicate Generic type				Ranges from light to medium gray, to a light brown, pink, blue or lavender with inclusions, splotches, mottling.	Western Nebraska.	White River Group
White River Group Plate Chalcedony AKA: Badlands Plate Chalcedony				Quarter inch thick ranging from clear to milky white with a rough milky white cortex	Northwestern Nebraska	White River Group
Winterset Chert AKA: Fusulinid Chert, Zebra Chert				Primarily homogenous, ranging to mottled or layered, ranging from a light to dark gray or brownish gray, opaque may have a "zebra" appearance	Eastern Nebraska	Winterset Limestone Member of the Dennis Limestone Formation, Kansas City Group
Youngsite Agate AKA: Hartsville Uplift Agate				Ranges in color from a yellowish tan to a rosy pink or a  grayish silver.  Gray undertones may be present.	Western Nebraska	Guernsey Limestone Formation