Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated Formation / Member
Alma Quartzite Variations: Buffalo County Quartzite and Lacross County Quartzite				Range from white to purple (Alma Quartzite), to an off white to a tan (Lacross variation), or tan to brown (Buffalo variation).	Northeastern Iowa
Argentine Chert				Ranges in color from a light tan to a pale to medium gray.  Light mottling or streaking may be present.	Southwestern Iowa	Argentine Member of the Wyandotte Limestone Formation
Bethany Falls Chert				Ranges from light to dark gray	Northwestern Iowa	Swope Formation
Blanding Chert Silurian Chert variant				Ranges from white to gray with faint bands of pale yellow, brown, and orange	Eastern Iowa	Blanding formation
Buffalo County Quartzite Alma Quartzite variant				Range from a tan to brown	Northeastern Iowa
Burlington Chert				Varies from white to gray or tan.  Banding and mottling may be present	Southeastern Iowa	Burlington Limestone Formation
Catlinite AKA: Red Pipestone				Ranges from a brownish red to a deep red color	Western Iowa	Sioux Quartzite Formation
Cedar Valley Chert Rapid Chert				Translucent ranging from a light to medium brown	Northeastern Iowa	Cedar Valley Formation, Rapid Member
Croton Tabular Chert Warsaw Tabular Chert				Very opaque and ranges in color from a creamy gray to a light gray with a off white to light tan cortex.	Southeastern Iowa	Croton formation
Curzon Chert				Ranges from a a light yellow brown to a light olive brown or brownish gray to a medium dark gray	Southwestern Iowa	Curzon Limestone of the Topeka formation
Elwood Chert Elwood- Joliet Chert				Ranges from white to gray	East central Iowa	Elwood formation
Ervine Creek Chert				Ranges from a light medium gray to a dark gray.  Larger white specks are formed by fossils	Southwestern Iowa	Ervine Creek Limestone Member, Deer Creek Limestone Formation
Excello Chert				Ranges from a dark bluish black to black.  Chalcedony veins are commonly seen through the material	Southern Iowa	Excello Formation
Galena Chert Platteville-Galena Chert				Ranges from gray to light tones of brown ,mottles and swirls White specks of fossil fragments.  Small flat vugs may be present.	East central Iowa	Platteville Dolomite formation
Gower Chert					East central Iowa	Gowen Formation, Silurian System
Grand Meadow Chert				Range from a light to medium gray and may be a solid color or mottled, may have a golden hue	Northeastern Iowa
Hampton Chert				White and off white.	Central Iowa	Hampton Member of the Maynes Creek Formation
Hertha Chert				White to a light gray color	Southwestern Iowa	Sniabar Member, Hertha Limestone Formation of the Kansas City Group
Hixton Silicified Sandstone / Quartzite AKA: Sugar Quartz				Range in color from white to tan (most common), but may vary from red to orange, lavender to brown, or yellows	Northeastern Iowa
Hopkinton Chert				Translucent light gray with white opaque mottling	East central Iowa	Hopkinton Formation
Joliet Chert Elwood- Joliet Chert				Ranges from white to gray	East central Iowa	Joliet formation
Kankakee Chert AKA for Blanding Chert Silurian Chert variant				Ranges from white to gray with faint bands of pale yellow, brown, and orange	Eastern Iowa	Blanding formation
Kenwood Chert				Black color	East central Iowa	Kenwood Member of the Wapsipinicon Formation
Knife River Flint Knife River Chert, Knife River Chalcedony				Ranges in color from a root beer, tea, coffee, or caramel brown	Northwestern Iowa	Eocene Golden Valley Formation
La Porte City Chert				Most commonly a medium to dark gray.  Less commonly the color ranges from a white to a light gray	Central Iowa	La Port City Chert Formation of the Devonian System
Lacross County Quartzite Alma Quartzite variant				Range from an off white to a tan	Northeastern Iowa
Maquoketa Chert AKA: Silurian 2 Chert				Ranges in color from a pale olive gray to a pale gray.  Banding or streaking may be present.	Northeastern Iowa	Maquoketa Formation
Maynes Creek Chert				Opaque and comes in a variety of colors including; cream, gray, and green.  It is commonly mottled and may be speckled or fossiliferous.	Central Iowa	Maynes Creek Limestone Formation
Moline Chert				Opaque to slightly translucent, ranges from a light gray to a very dark gray, streaks or specks of black, bluish tints are commonly present	South central to east central Iowa	Spoon Formation
Montrose Chert				Light to medium bluish gray and often resembles a chert breccia.	Southeastern Iowa	Montrose Member of the Keokuku Limestone Formation
Nehawka Chert Rice Grain Chert and Pennsylvanian Chert				Ranges from grayish blue to blue with oolitic white specks	Southwestern Iowa	Pennsylvanian Limestone Formation
Oneota Chert AKA: Oneota Prairie de Chein Chert (lower)				Ranges from white to gray or yellowish or orange	Northeastern to central Iowa	Lower Prairie de Chien Group,  Oneota formation
Palisades Kepler Chert				Ranges from a tan to black	East central Iowa	Scotch Grove Formation, Buck Creek Member
Platteville - Galena Chert Galena Chert				Ranges from gray to light tones of brown ,mottles and swirls White specks of fossil fragments.  Small flat vugs may be present.	East central Iowa	Platteville Dolomite formation
Plattsmouth Fossiliferous Chert Rice Agate				Ranges in color from a medium to medium dark gray or brownish gray or almost black.  Light brownish fossils form specks.	Southwestern Iowa	Plattsmouth Member of the Oread Formation, Virgilian series, Shawnee Group
Prairie du Chein Chert				Mottled and ranges in color from an off white to a light cream	Northeastern Iowa	Prairie du Chein group
Rapid Chert Cedar Valley Chert variation				Ranges in color from a medium gray to a olive gray or yellowish gray, grayish orange, or pale brown with darker fossil inclusions.	Northeastern to eastern Iowa	Rapid Member of the Cedar Valley Formation
Raytown Chert Fusulinid Chert				Ranges in color from a pale brown to a dark reddish gray, grays, tans, or pinkish white.  Often broad light mottling is present	South central Iowa	Raytown member, Iola Limestone Formation,  Kansas City Group
Root River Chert / Jasperoid Cedar Valley Chert variation				Opaque and ranges in color from yellowish brown to dark brown or an ocher color with mottling	Northeastern Iowa	Cedar Valley Formation, Rapid Member.
Scotch Grove Chert AKA: Wapsipinicon Chert				Mottled and ranges from a gray to a light tan or brown	East central Iowa	Scotch Grove Formation, upper Silurian Group
Shakopee Chert				Ranges from white to gray with contrasting banding	Eastern to central Iowa	Shakopee Dolomite 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	Southwestern Iowa	Sheldon Member of the Topeka Formation, Shawnee Group
Shell Rock Chert				Mottled white to light gray in color.  It has light gray colonial corals present.	North central Iowa
Sioux Jasper				Ranges in color from a brownish yellow to red	Western Iowa	Sioux Formation
Sioux Quartzite				Ranges from a light grayish tan to a medium grayish brown.	Western Iowa	Sioux Formation
Spergen Chert AKA: Spergen Crystalline Saccaroidal Dolomite				Commonly banded or mottled and ranges in color from a very light gray to a gray or brownish gray, and a pale yellow to a tan	Southeastern Iowa	Spergen Formation
Spring Branch Chert				Primarily a medium gray chert with darker fossil inclusions.  Bluish gray chalcedony vugs may be present.	Southwestern Iowa	Spring Branch Limestone of the Lecompton Formation
Spring Hill Chert				Strongly mottled and ranges from light to dark gray with dark speckles being present.	Southwestern Iowa	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.	Southwestern Iowa	Stoner Member of the Stanton Formation, Lansing Group
Swan River Chert				Ranges from a creamy white to gray, pink to a rust, or pale yellow to deep orange, commonly has banding	Northwestern Iowa	Souris River Formation, Point Wilks Member
Toronto Chert				Homogenous ranging from a white to a pale brown or yellowish brown.	Southwestern Iowa	Toronto Limestone Member, Oread Formation of the Shawnee Group
Tongue River Silicified Sediment				Grayish brown sediment, pseudoquartzite, or arenaceous chert	Northwestern Iowa	Slope / Bullion Creek formation
Verdi Chert				Light gray to medium brown streaked appearance and ranges in color from a grayish orange to a yellowish gray	Southeastern Iowa	Verdi Member of the St. Louis Formation, Meramecian Series
Wapsipinicon Chert AKA for Scotch Grove Chert				Mottled and ranges from a gray to a light tan or brown	East central Iowa	Scotch Grove Formation, upper Silurian Group
Warsaw Chalcedonic Chert Croton Chalcedonic Chert				Ranges from a pale tan or brownish gray to a medium brown,  White streaking is commonly present along with white fossil remnants.	Southeastern Iowa	Osagen Series
Warsaw Dolomitic Chert				Ranges from a pale tan or brownish gray to a medium brown,  White streaking is commonly present along with white fossil remnants	Southeastern Iowa	Osagen Series
Wassonville Chert A- Fossiliferous B - Mottled				Ranges in color from a very light gray to a medium gray with densely packed fossil fragments.	Southeastern Iowa	Wassonville Member, Hampton Formation
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	Southwestern Iowa	Winterset Limestone Member of the Dennis Limestone Formation, Kansas City Group