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.	Colorado
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	Northwestern Colorado	Bridger Formation
Alibates Chert				Mottled color from most commonly reds, yellows, and oranges in iron rich areas to blues and dark greens	Southeastern Colorado	Quartermaster Formation
Amazon (Colorado) Jade Amazonite / Feldsar				Ranges from a bluish green to green	Central Colorado
American Nettie Quartzite Dakota Quartzite variant					Southwestern Colorado	American Nettie Member of the Dakota Quartzite Formation
Arkansas River Agate					Southeastern Colorado
Arroyo Penasco Chert				White	South central Colorado	Arroyo Penasco Formation
Austin Bluff Agate / Carnelian				Agate is mottled and ranges from rich red and brown color.  Carnelian is a is cherry red	East central Colorado
Badger Creek Chert					Colorado
Bald Mountain Dactite / Rhyolite					Central Colorado
Baldy Hill Jasper AKA: Cimarron River Jasper				Mottled color from most commonly varying shades of reds and yellows.	Southeastern Colorado	Baldy Hill Formation
Barger Gulch Chert				Similar to chalcedony with a translucent base with hues ranging from white to light yellow.  Black dendritic, starburst inclusions are present. .	Central Colorado	Troublesome Formation
Basalt				Ranges from black to gray	Colorado	Volcanic
Beulah Chert				Mottled with colors of red, gray, buff, and purple	Colorado	Beulah Formation
Black Forest Silicified Wood AKA: Bijou Basin and Elizabeth Petrified Wood				Layered and banded with colors of tan, beige, brownish gray, and brown or a butterscotch colored jasper with large dark brown mottling and visible wood grain.	Central Colorado	Dawson Formation
Blanco Basin Mudstone				Primarily a reddish brown, but may range to red, maroon, purple green or gray, mottling may be present	South central Colorado	Blanco Basin 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.	Northwestern Colorado	Browns Park Formation
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.	Southwestern Colorado	Brushy Basin Member of the Morrison Formation
Brushy Basin Quartzite					South central Colorado	Brushy Basin Member of the Morrison Formation
Buffalo Peaks Chert				Ranges in color from from yellowish tan color with linear black to gray inclusions	Central Colorado	Troublesome Formation
Burro Canyon Chert				Variegated ranging from white to yellow, tan to medium brown, light to medium gray, light to medium green or shades of red with algae banding or other fossils.	West central Colorado	Upper Burro Canyon Formation
Burro Canyon Quartzite				Ranges from off white to tan light gray or light green.  May have mottling of darker gray.	West central Colorado	Upper Burro Canyon Formation
Castle Rock Petrified Wood					Central Colorado.
Charma Jasper				Mottled mustard yellow with intrusions of white quartz.	Southwestern Colorado
Cherry Creek Petrified Wood AKA: Running Creek Petrified Wood				Shades of reds, browns, and whites	Central Colorado
Coal Creek Metaquartzite				Ranges from white to light gray or pink	Central Colorado	Coal Creek Formation
Cripple Creek Turquoise AKA: Hidden Treasure Turquoise					Central Colorado
Cumbres Pass Chert				Ranges in color from an opaque mottled white gray to tan.  Chalcedony inclusions are throughout the chert matrix.	Southwestern Colorado
Curio Hill Agate				Banded agate	Central Colorado
Dakota Quartzite AKA: Dakota Orthoquartzite				Ranges in color from reds to browns	Central to eastern Colorado	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	Central to northeastern Colorado	Dawson Formation
Del Norte Plume Agate AKA: Embargo Plume Agate				Banded clear matrix with golden or orangish yellow plumes.	Southwestern Colorado
Douglas Mountain Jasper AKA: Cross County Jasper, Tank Peak Jasper					Northwestern Colorado	Morgan Formation
Elimia Agate AKA: Turritella Agate				Black to brownish gray or brownish black matrix with light gray snail shells.	Northwestern Colorado	Green River Formation
Emmons Peak Quartzite AKA: Uinta Quartzite				Ranges from an off white to a red or reddish purple.	Northwestern Colorado	Emmons Formation
Empire Gulch Rhyolite				White with many small clear sharp quartz crystals	Central Colorado
Flattop Butte Chalcedony AKA: Flattop Mesa Chalcedony				Ranges from opaque white to translucent lavender with specks of blue and pink.	Northeastern Colorado	Chadron capstone
Florissant Petrified Wood					Central Colorado	Florissant Formation
Fremont Chert				Ranges in color including red, pink, purple, buff, brown, yellow, gray, blue, and white.  Mottling, banding, speckles, and veins may be present.	Central Colorado	Fremont Formation
Gilson Gulch Opalescent				Blue and yellow	North central Colorado
Gunnison River Chalcedony / Jasper				Light blue chalcedony	Southwestern Colorado	Dakota Sandstone Formation
Hall Turquoise				Fair blue color with veins of darker material	Southwestern Colorado
Hardscrabble Chert				Ranges from a cream to a tan or orange, banded lavender, gray, and purple and solid white chert also occurs.	Central Colorado	Hardscrabble 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	Northeastern Colorado	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.	Northeastern Colorado	Hartville Formation
Holiday Springs Moss Agate				Matrix that ranges from a translucent brown, gray or whitish or an opaque white with black dendritic inclusions	Northeastern Colorado	White River Group
Holy Cross Turquoise				Blue in color	Central Colorado
Hot Sulfur Springs Agate / Petrified Wood				Cloudy	Northwestern Colorado
Kalouse Jasper / Petrified Wood				Commonly has concentric banding, ranges from medium brown, yellow, brown, or purple.  Rarely bright orangish red or off white occurs.	Northeastern Colorado	Ingleside Formation, White River Group
Kimball Chert				Ranges from tannish off white to tan or light brownish gray.  Commonly has dendritic inclusions.	Northeastern Colorado	Ogallala Formation
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.	Southwestern Colorado
Kiowa Creek Agate / Carnelian					Northeastern Colorado
Kiowa Creek Petrified Wood AKA: Bijou Creek Petrified Wood					Northeastern Colorado
Kremmling Chert AKA: Troublesome Chert				base of white and hues ranging from light yellow, light gray or light brown, slight mottling or banding and black dendritic inclusions may be present	North central Colorado	Troublesome Formation
La Garita Creek Chalcedony					South central Colorado
Larkspur Egyptian Jasper / Carnelian / Ribbon Agate / Petrified Wood					Central Colorado
Last Chance Turquoise					Northwestern Colorado
Leadville Chert				Ranges from a dark gray to black	West central Colorado	Leadville Limestone Formation
Leadville Turquoise AKA: Josie May Turquoise					West central Colorado	Leadville Limestone Formation
Manassa Turquoise AKA: King's Manassa				Ranges from a brownish green to green with dark brownish yellow to black mottling	South central Colorado
Middle Park Moss Agate / Petrified Wood					Northwestern Colorado
Morgan Chert AKA: Morgan - Maddison Chert, Morgan Jasper				Has colors of orange to a pumpkin orange, reds, yellowish "mustard" brown to a reddish brown.	Northwestern Colorado	Morgan 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.	North central Colorado	Morrison and Cloverly formations
Morrison - Cloverly Quartzite AKA: Morrison - Cloverly Orthoquartzite				Ranges from a tan to brown or purple to maroon or gray.	Western Colorado	Morrison and Cloverly formation
Morrison Silicified Sandstone				Commonly mottled and ranges in shaded of maroon, green, tan, and brown.	Western Colorado	Brushy Basin Member of the Morrison Formation
Morrison Mudstone				Commonly mottled and ranges in shaded of maroon, green, tan, and brown.	Southwestern Colorado	Burro Canyon Formation / Brushy Basin Member,  Morrison Formation
Morrison Chert				Commonly mottled and ranges in shaded of maroon, green, tan, and brown.	Southwestern Colorado	Burro Canyon Formation / Brushy Basin Member, Morrison Formation
Mount Sopris Jasper / Jasp-Agate AKA: Sopris Jasper				Ranges from a orangish red to red, dark red, yellow, tan, grayish tan to a dark brown jasper with red to sardonyx jasp agate	West central Colorado
Nugget Sandstone				Ranges from buff to pink.	Northwestern Colorado	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)	Colorado	Volcanic
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	Eastern Colorado	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.	Eastern Colorado	Ogallala Formation
Opal Hill Opal / Chalcedony				Primarily milky white with black, brown, and pea green occurring	West central Colorado
Opal Hill Petrified Wood				Primarily milky white with black, brown, and pea green occurring	West central Colorado
Parker Petrified Wood AKA: Cherry Creek Petrified Wood, Moore Ranch Petrified Wood				Ranges from a yellowish tan with clear linear inclusions to a reddish tan with dark tan inclusions.	Central Colorado
Pawnee Grassland Quartzite				Ranges in color from a pinkish to a yellowish tan.	Northeastern Colorado	Pawnee Creek Bed Formation
Petrified Wood AKA: Agatized Wood, Opalized Wood				Vary in color based on the minerals present during the process	Colorado	Varies
Pinon Mesa Petrified Wood				Colors of brown, tan and brownish yellow with "wood grain" and rings being present.	West central Colorado
Poncha Pass Agate / Jasper				Blue agate	Southwestern Colorado
Ptarmigan Chert AKA: Manitou Chert				Occurs in colors of pink, red, orange, tan yellow, brown, gray and white.  Mottling or speckle or inclusions may also be present.	Central Colorado	Ptarmigan Chert Member, Manitou Limestone Formation
Red Creek Quartzite Uinta Quartzite variant				Very crystalline white quartzite.	Northwestern Colorado
Rhyolite				Gray to grayish black, flow banding may be present alternating from light to darker gray	North America	Volcanic Activity
Round Valley Chert				Ranges from gray to a bluish gray.	Northwestern Colorado	Round Valley Formation
Saint Stephens Stone				Whitish translucent chalcedony with red spots	Central Colorado
Salt Works Cloudy Agate / Moss Agate, Petrified Wood, Opalitic Jasper					Central Colorado
Salt Works Chalcedony				Ranges from a lavender to a blue.	Central Colorado
San Luis Valley Plume Agate					South central Colorado
Sawatch Quartzite				White to a ferruginous red	Central Colorado	Sawatch Formation
Silicified Dinosaur Bone					Colorado
Sowbelly Agate				Quarter inch alternating bands of brown, purplish brown and white.  Has light purple, blue, brown, amethyst with galena or silver inclusions.	West central Colorado
St. Stephens Stone Banded Agate					Central Colorado
Summerville Chert				Two variations.  One is black chert and the other is a white opalitic chert.	West central Colorado	Summerville Formation
Table Mountain Chert / Jasper				Exhibits orange and red coloring with clear veins	North central Colorado	Troublesome Formation
Table Mountain Opal				Ranges from red to a reddish brown or brownish orange.	Central Colorado
Table Mountain Petrified Wood AKA: Green Mountain Petrified Wood					Central Colorado
Thirtyone Mile Mountain Chalcedony				Light blue banded chalcedony	Central Colorado
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.	Northwestern Colorado	Bridger Formation
Tomichi Chert				Mottled bluish gray color weathering brown.	Southwestern Colorado	Tomichi Limestone Formation
Trout Creek Chert / Jasper				Ranges from a dusky red to a yellowish brown with inclusions or lines forming intricate patters are commonly present..	Central Colorado	Manitou or the Fremont 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.	Northwestern Colorado	Green River Formation
Upper Rio Grande Jasper / Opal				Mottled yellow color with inclusions of varicolored opal.	South central Colorado
Wagon Wheel Gap Carnelian				Clear and variegated	South central Colorado
Wamsutter Oolitic Chert AKA: Green River Oolitic Chert				Ranges from an off white to a medium brown with white oolitic specks throughout the material	Northwestern Colorado	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.	Northeastern Colorado	White River Group
Willow Creek Chalcedony / Carnelian					North central Colorado
Willow Creek Ribbon Jasper					North central Colorado
Williams Canyon Chert				Ranges from grayish white to gray.	Central Colorado	Williams Canyon Limestone Formation
Williams Fork Moss Agate					Central Colorado
Windy Ridge Quartzite				Ranges in color from a yellowish tan to a rosy pink or a  grayish silver.  Gray undertones may be present.	Central Colorado	Dakota Quartzite
Wolf Creek Pass Sagenitic Agate					South central Colorado	Treasure Island Rhyolite Formation