Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated                 Formation / Member
Absaroka Chert				Primarily green in color	Northwestern Wyoming
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.	Wyoming
Algal Chert Tiger Chert variation				Streaked ranging from most commonly a light gray to light brown, less commonly a very light gray to black or a very light brown to a very dark brown	South central Wyoming	Bridger Formation
Almond Orthoquartzite				Purple	South central Wyoming	Almond Formation of the Mesa Verde Group
Amsden Chert				Ranges from most commonly gray or blue, but tan is also present.	North central Wyoming	Amsden Formation
Angel Agate				Pale greenish gray color with a chalky white cortex	Central Wyoming	Split Rock Formation
Aspen Porcellanite				Ranges in color from white to pink.	West central Wyoming	Aspen Formation
Bacon Ridge Porcellanite				Pearly gray	Southwestern Wyoming	Bacon Ridge Formation
Badlands Chert				Ranges from a yellowish brown to a pale reddish purple or dark yellowish orange	Northeastern Wyoming
Badlands Moss Agate				Translucent medium yellowish brown to dark yellowish orange with dendritic inclusions.	Northeastern Wyoming
Basalt				Ranges from black to gray	Wyoming	Volcanic
Baxter Porcellanite				Ranges from a tan to a dark brown.	Southwestern Wyoming	Baxter Formation
Bear Canyon Agate				Banded ranging from black and white to a dark gray and light gray.	North central Wyoming
Belvoir Ranch Chert				Ranges in color a dark brown to a purplish or reddish brown color.  Purplish veins and white circular inclusions are present.	Southeastern Wyoming
Big Horn Chert AKA for Phosphoria Chert				Ranges from colors of red, maroon, purple, orangish red, green, black and white.	Central, northern, and western Wyoming	Phosphoria Formation
Big Horn Plume Agate				Clear white or light blue matrix with black or metallic plumes	North central Wyoming
Big Sandy Petrified Wood AKA: Petrified Palm Wood				Ranges from tans to dark browns.  Wood grain and white inclusions are present.  The cortex is commonly white.	Southwestern Wyoming	Green River Formation
Black Buttes Jasp-Agate				Ranges from a reddish brown to a dark gray with white quartz veins, quartz filled vugs and inclusions of yellow to orange, dark brown, purple.	West central Wyoming
Black Hills Quartzite				Ranges from a tan to brown or purple to maroon or gray.	Northeastern Wyoming	Fall River Formation
Blue Forest Petrified Wood				Opalitic blue with grain and rings present.	Southwestern Wyoming	Laney Member of the Green River Formation
Browns Park Chert				Similar to chalcedony with a opaque base of white and translucent hues ranging from light yellow, light to dark gray or light brown.	Colorado, Wyoming	Browns Park Formation
Cedar Mountain Agate / Jasp-Agate				Multi-colored agate / moss / flame / plume agate with dendritic inclusion and jasp-agate is red and yellow with white and blue streaks.	Northwestern Wyoming	Bishop Conglomerate Formation
Chadron Chert				Mottled and ranges from tan or yellowish brown to red or gray.  Vugs filled with chalcedony or drusy quartz may be present.	Southeastern Wyoming	Chadron Formation
Cloverly Quartzite				Ranges from a light gray to gray and a grayish red to a purple.	Wyoming	Cloverly Formation
Cougar Creek Obsidian				Black with many white "snowflake" inclusions	Northwestern Wyoming
Crazy Horse Petrified Wood				Ranges in color from black to tan or blue with a wood grain appearance  The cortex is white.	Southwestern Wyoming
Crazy Woman Creek Petrified Wood				Colors of white, tan, brown, and black, a wood grain appearance is present.	Central Wyoming
Crescent Hill Chert				Primarily homogenous and ranges in color from purple to red or orange, black and green.  Inclusions are commonly present.	Northwestern Wyoming	Crescent Hills Basalt Formation, Absaroka Supervolcanic Group
Cumberland Flats Petrified Wood					Southwestern Wyoming
Deadwood Quartzite				Type 1  course grain quartzite ranging from dark red to orange Type 2  fine grain quartzite ranging from a yellowish gray to brown	Northeastern Wyoming	Deadwood Formation
Deep Lake Metaquartzite				Ranges from a grayish white to a dark gray or brownish gray.	South central Wyoming	Early Algonkian
Delaney Rim Agate				Mottled ranging from white, black, and tan to brownish black and brown.	Southwestern Wyoming
Dollar Mountain Chert / Chalcedony				Mottled ranging from caramel / yellow / brown to red / pink / maroon or light and dark gray.	Central Wyoming	Bighorn Formation
Dry Head Agate AKA: Big Horn Agate				Banded and ranges in color from red, pink, yellow, orange, white and brown with swirls and "eyes" present.	North central Wyoming	Phosphoria Formation
Dry Lakes Agate					Central Wyoming	Split Rock Formation
DuBois Moss Agate				Ranges from green to gray with brown or black dendritic inclusions.	West central Wyoming
Eastern Petrified Wood AKA: Lake Butte Petrified Wood				Ranges from reds to yellows with inclusions of milky white.  wood grain" and rings are present in the material.  The outer cortex ranges from chalky whites to pale yellows.	Northwestern Wyoming	Langford Formation
Eden Valley Petrified Wood				Various colors of agate often including full limbs, knots, cracks, braches, burrows and grain.  The outer coating if coated with algae.	Southwestern Wyoming	Green River Formation
Elimia Agate AKA: Turritella Agate				Black to brownish gray or brownish black matrix with light gray snail shells.	Southwestern Wyoming	Green River Formation
Elk Creek Basalt				Ranges from a dark gray to black	Northwestern Wyoming	Elk Creek Basalt Member, Washburn Group, Absaroka Supervolcanic
Emmons Peak Quartzite AKA: Uinta Quartzite				Ranges from an off white to a red.	Southwestern Wyoming	Emmons 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	East central Wyoming	Chadron Formation, White River Group
Flathead Quartzite AKA: Alpreston Quartzite				Ranges light reddish to an orangish red.	Northwestern Wyoming	Flathead Quartzite Formation
Flattop Butte Chalcedony AKA: Flattop Mesa Chalcedony				Ranges from opaque white to translucent lavender with specks of blue and pink.	Southeastern Wyoming	Chadron capstone
Fort Union Porcellanite AKA: Powder River Chert				Ranges from most commonly a light gray to a light purple or red.	Northeastern Wyoming	Fort Union Formation
Fourmile Gulch Petrified Wood					Southwestern Wyoming	Bridger Formation
Gallatin Petrified Forest Wood AKA: Specimen Ridge, Bighorn Peak Petrified Wood				Ranges from reds to yellows with inclusions of milky white.  "Wood grain" and rings are present in the material.	Northwestern Wyoming	Sepulcher Formation
Goose Egg Chert				Ranges from a gray to a dark gray or reddish gray color	Central Wyoming	Goose Egg Formation
Harabell Porcellanite				Light green tuffaceous porcellanite	Northwestern Wyoming	Harebell Formation
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	Southeastern Wyoming	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.	Southeastern Wyoming	Hartville Formation
Hilliard Porcellanite				Platy and opaque ranging from a tan to dark brown in color.	Southwestern Wyoming	Hilliard Formation
Hogback Chalcedony				Ranges from light gray to brown with small lighter colored circles.  Mottling may be present	Northeastern Wyoming
Hogback Quartzite				Ranges from light tan to dark brown.	Northeastern Wyoming
Irish Rock Chert				Ranges from a light grayish green to a dark blackish green,  but may range to hues of caramel or red.	Northwestern Wyoming
Jack Creek Quartzite				White	Wyoming	Jack Creek Formation
Jack Morrow Hills Petrified Wood					Southwestern Wyoming
Kingsbury Chert				Dark colored chert	Northeastern Wyoming	Kingsbury Member of the Wasatch Formation
Laketown Chert				Light gray	Southwestern Wyoming	Laketown Dolomite Member of the Guilmette Formation
Lamar Valley Petrified Wood AKA: Amethyst, Mountian, Specimen, Fossil Forest				Ranges from reds to yellows with milky white wood grain, rings are present, outer cortex ranges from chalky whites to pale yellows.	Northwestern Wyoming	Lamar Formation
Lost Canyon Moss Agate				Red moss agate	East central Wyoming
Lysite Agate AKA: Lysaght Agate				Banded and plume agate with fortification lines ranging from reds to browns and white to clear or blue.	Central Wyoming	Lysite Member of the White River Formation
Madison Chert AKA: Montana Chert				White to a grayish white with black dendritic inclusions.	Northwestern Wyoming	Madison Limestone Formation
Medicine Bow Plume Agate				Translucent milky white chalcedony with dark inclusions forming plumes.	South central Wyoming
Medicine Peak Quartzite				Ranges from a violet gray to a steel gray.	South central Wyoming	Medicine Peak Formation
Minnekahta Chert				Medium brown with a red mesh of hematite and limonite and round quartz inclusions.	East central Wyoming	Minnekahta Limestone Formation
Morrison - Cloverly Porcellanite AKA: Morrison - Clovery Chert				Variegated with colors ranging from gray to blue or red and yellow.  Commonly mottled and streaked by fossilized roots and burrows.	Central to eastern Wyoming	Morrison and Cloverly formations
Morrison - Cloverly Quartzite AKA: Morrison - Cloverly Orthoquartzite				Ranges from a tan to brown or purple to maroon or gray.	Central to eastern Wyoming	Morrison and Cloverly formation
Muddy Mountain Chert				Brecciated with colors ranging from most commonly a reddish brown, but black, blue and white layers do occur.	West central Wyoming	Muddy Mountain Chert Member of the Madison Formation
Northeastern Petrified Wood AKA: Bison Peak, Barronette Peak, Mount Hornaday Petrified Wood				Ranges from reds to yellows with inclusions of milky white.  "wood grain" and rings with a cortex ranges chalky whites to pale yellows.	Northwestern Wyoming	Lamar Formation
Obsidian AKA: Volcanic Glass				Black to black with bands of dark reds (mahogany obsidian) or white flakes (snowflake obsidian)	Wyoming	Volcanic
Obsidian Cliff Obsidian				Most commonly black, but can range from black to brown, mahogany, gray or green.	Northwestern Wyoming
Opeche Chert AKA: Opeche Siltstone				Reddish color	East central Wyoming	Opeche Formation
Park Point Obsidian				Most commonly mahogany (black with brownish red), but black occurs less often.	Northwestern Wyoming
Parker Peak Ignimbriote				Black with white crystalline inclusions	Northwestern Wyoming
Pawnee Grassland Quartzite				Ranges in color from a pinkish to a yellowish tan.	Southeastern Wyoming	Pawnee Creek Bed Formation
Petrified Wood AKA: Agatized Wood, Opalized Wood				Vary in color based on the minerals present during the process	Wyoming	Varies
Phosphoria Chert AKA: Tosi Chert, Big Horn Chert				Ranges from colors of red, maroon, purple, orangish red, green, black and white.	Central to western Wyoming	Tosi Member of the Phosphoria Formation
Platte County Chert				Mottled and ranges from a light purple to a reddish purple.  Vugs filled with course darker purple quartz are commonly present.	Southeastern Wyoming
Porcellanite Generic type				Ranges from white to brown or various shades of gray	Wyoming	Varies
Powder River Porcellanite					Northeastern Wyoming	Powder River Formation
Prairie Agate				Concentric banding and is a marbled mixture of chalcedony and different colors of jasper	East central Wyoming	Chadron Formation
Quadrant Quartzite				Ranges from white to a pale yellow or pale pink color.	Northwestern Wyoming	Quadrant Formation
Quaking Asp Mountain Jasperoid				Light to dark gray agate with  banding red, yellowish orange and gray jasp-agate and veins of quartz..	Southwestern Wyoming
Red Creek Quartzite Uinta Quartzite variant				Very crystalline white quartzite.	Southwestern Wyoming
Red Desert Black Palm Wood				Black	South central Wyoming
Red Desert Agate / Jasper				Primarily shades of red with shades of white, yellow, yellowish brown, and gray.	South central Wyoming
Rex Chert				Ranges from a brownish red to purple or an ashy gray to black	Southwestern Wyoming	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
Schmitt Chert					Northwestern Wyoming	Mission Canyon Limestone and Lodgepole Limestone formations of the Madison Group
Seminole Mountain Jasp-Agate				Contains alternating layers of brown jasper and grunerite, dark gray quartz, and magnetized black magnetite	South central Wyoming
Sevenmile Ridge Chert Tiger Chert variation				Most commonly very dark brown to black, but may range to a medium brown with a light brown mottling.	Southeastern Wyoming	Bridger Formation
Sheep Canyon Dendritic Jasper				Ranges from a yellowish brown with black speckles to a light grayish brown with red speckles	Northwestern Wyoming
Shirley Basin Petrified Wood / Jasp-Agate				Wood has colors of white to brown to black.  The jasp-agate is a pink breccia matrix cemented with a reddish brown or gray to black.	Central Wyoming	Windy River Formation
Silicified Dinosaur Bone					Wyoming
Six Mile Hill Petrified Wood					South central Wyoming
Slater Agate / Chalcedony				White outer coating, interior dark gray to black agate surrounding a milky white center with small black inclusions.	Southeastern Wyoming	Guernsey Formation of the Hartville Uplift
Spanish Diggings Agate				Mottled and banded red gray and red.	East central Wyoming	Fall River and Lamoka Formation of the Inyan Kara Group
Spanish Diggings Chert				Mottled and ranges from a brown to gray.	East central Wyoming	Fall River and Lamoka Formation of the Inyan Kara Group
Spanish Diggings Dendritic Jasper				Greenish yellow color with dark dendritic inclusions.	East central Wyoming	Fall River and Lamoka Formation of the Inyan Kara Group
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	East central Wyoming	Fall River and Lamoka Formation of the Inyan Kara Group
Spanish Diggings Red Breccia				Brecciated with shade of red.	East central Wyoming	Fall River and Lamoka Formation of the Inyan Kara Group
Spanish Point Agate				Ranges from white to a light tannish white or grayish white with dark dendritic starburst and inclusions.	North central Wyoming	White River Formation
Spearfish Chert				Ranges from a grayish red to purple	East central Wyoming	Spearfish Limestone Formation
Stefoinite Brecciated Jasper				Brecciated with shades of tan, brown, and white.	Southwestern Wyoming
Sweetwater Moss Agate				Brown cortex with a light gray to blue matrix and black dendritic inclusions.	South central Wyoming	Split Rock Formation
Tensleep Quartzite				Most commonly a light tan to tan, but grays, greens, reds and pinks do occur.	West central Wyoming	Tensleep Sandstone Formation
Teton Chert				White	Northwestern Wyoming	Teton Formation
Teton Pass Obsidian AKA: Crescent H Obsidian				Ranges from black to gray and is banded.	Northwestern Wyoming
Tiger Chert AKA: Bridger Basin, Green River, Oil Chert, Zebra Chert, Shavetail Chert				Primarily dark brown with wide tan banding.  If the material is smaller, the tan could be primary with the darker brown bands.	Southwestern Wyoming	Bridger Formation
Tin Cup Jasper				Jasper breccia or banded  with angular fragments of ranges from deep red to a dark brown, butterscotch yellowish brown	West central Wyoming
Tongue River Silicified Sediment AKA: Tongue River Silica				Grayish brown sediment, pseudoquartzite, or arenaceous chert	Northeastern Wyoming	Slope / Bullion Creek formation
Tower Region Petrified Wood AKA: Yancy's Forest, Roosevelt Lodge Petrified Wood				Ranges from reds to yellows with inclusions of milky white.  "Wood grain" and rings are present in the material.	Northwest Wyoming	Lamar Formation
Trapper Creek Agate				Colors of brown to to cream with dendritic inclusions.	Wyoming	Madison Limestone 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
Turritella Agate AKA for Elimia Agate				Black to brownish gray or brownish black matrix with light gray snail shells.	Southwestern Wyoming	Green River Formation
Twin Creek Agate				Irregular banded with red and golden yellow flame jasper.	Southwestern Wyoming	Amsden or Phosphoria Formations
Upper Lamar Petrified Wood AKA: Miller Creek, Cache Creek, Cache Mountain, Abiathar Peak, The Thunderer				Ranges from reds to yellows with inclusions of milky white.  "Wood grain" and rings are present in the material.  The outer cortex ranges from chalky whites to pale yellows.	Northwestern Wyoming	Lamar Formation
Wamsutter Oolitic Chert AKA: Green River Oolitic Chert				Ranges from an off white to a medium brown with white oolitic specks throughout the material	North central Wyoming	Green River Formation
Whiskey Basin Petrified Wood					West central Wyoming	Bridger Formation
Whiskey Butte Chert				Algal chert ranging from black to dark brown or tan with light blue opal inclusions.	West central Wyoming	Laney Member of the Green River Formation
White River Group Silicate Generic type				Ranges from light to medium gray, to a light brown, pink, blue or lavender with inclusions, splotches, mottling.	Eastern Wyoming	White River Group
Whitewood Chert AKA: Deadwood Chert				Colors of light gray, pinks and reds, and tan.	Northeastern Wyoming	Whitewood Limestone (dolomite) Formation
Wiggins Fork Petrified Wood AKA: DeBois Petrified Wood				Colors of red, brown, gray white and green.  Banding and wood grain is present.	West central Wyoming	Wiggins Formation
Yellow Tree Jasper				Ranges from a yellow to a light brown or light orange with black "tree like" dendritic inclusions.	Central Wyoming
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.	East central Wyoming	Guernsey Limestone Formation