Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated Formation / Member
Abitibi Chert AKA: Lake of the Woods Chert				Ranges in color white mottled with green, to a homogenous dark green	Northwestern Minnesota	South Kakagi Lake formation
Ajibik Quartzite AKA: Kakabeka Quartzite				Ranges from a light gray to a flesh or tan color.  Commonly  stained spots that range from tan to yellow, or a reddish brown	Northeastern Minnesota	Lower Marquette series
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).	Southeastern Minnesota
Animikie Chert				Deep green color	Northeastern to central Minnesota	Animikie formation, Marquette Range subgroup
Arcadia Ridge Orthquartzite				Ranges in color from a tannish white to a light tan	Southeastern Minnesota
Banded Jasper				Multi colored with red banding	Northeastern Minnesota
Barron County Pipestone				Ranges in color from a homogenous pink to red.	East central Minnesota
Barron County Quartzite				Ranges in color from a light yellow to a pale purplish pink.  Striping, banding, or staining may be present	Northeastern Minnesota
Bethany Falls Chert				Ranges from light to dark gray	Southwestern Minnesota	Swope Formation
Biwabik Silica					Northeastern Minnesota
Blanding Chert Silurian Chert variant				Ranges from white to gray with faint bands of pale yellow, brown, and orange	Southeastern Minnesota	Blanding formation
Buffalo County Quartzite Alma Quartzite variant				Range from a tan to brown	Southeastern Minnesota
Catlinite AKA: Red Pipestone				Ranges from a brownish red to a deep red color	Southwestern Minnesota	Sioux Quartzite Formation
Cedar Valley Chert Rapid Chert				Translucent ranging from a light to medium brown	Southeastern Minnesota	Cedar Valley Formation, Rapid Member
Cedar Valley Jasper					Southeastern Minnesota
Cochrane Chert				Ranges in color from a medium tan to a dark brown.  It is often banded or mottled.  Quartz inclusion may be present.	Southeastern Minnesota	Reedstown Member
Fat Rock Quartzite				White	Central Minnesota	Little Falls formation
Grand Meadow Chert				Range from a light to medium gray and may be a solid color or mottled, may have a golden hue	Southeastern Minnesota
Grand Portage Graywacke				greenish gray color	Northeastern Minnesota	Grand Portage Formation
Gun Flint Silica Brandon Flint				Translucent to transparent and ranges in color from a gray to bluish gray or almost colorless.  Small black inclusions throughout the material	Northeastern Minnesota	Gunflint Formation, Animikian 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	Southeastern Minnesota
Hudson Bay Lowland Chert				Bluish gray to a light tan or pale yellow	Northeastern Minnesota	Severen, Ekwan, and Stooping river formations
Jasper Taconite Taconite Jasper AKA: Gun Flint, Mary Ellen Jasper				Deep red color to black or blue with darker small round inclusions.  The inclusion can vary in color from dark green, dark blue, or black	Northeastern Minnesota	Gunflint Formation, Animikian Group
Kakabeka Chert				Ranges in color from grays with streaks of yellow, orange, or reds.  Needle shaped inclusions can give the material a wood grain appearance.	Northeastern Minnesota	Gunflint Formation
Kankakee Chert AKA for Blanding Chert Silurian Chert variant				Ranges from white to gray with faint bands of pale yellow, brown, and orange	Southeastern Minnesota	Blanding formation
Knife Lake Siltstone				Ranges in color from a greenish gray to black	Northeastern Minnesota
Knife River Flint Knife River Chert, Knife River Chalcedony				Ranges in color from a root beer, tea, coffee, or caramel brown	Southwestern Minnesota	Eocene Golden Valley Formation
Lacross County Quartzite Alma Quartzite variant				Range from an off white to a tan	Southeastern Minnesota
Lake of the Woods Chert				Ranges from a white mottled with green to a homogenous dark green to black color	Northwestern Minnesota	South Kakagi Lake Formation
Lake of the Woods Rhyolite				Ranges in color from a greenish gray to less commonly a gray.  Streaks of brown to orangish brown may be present.	Northwestern Minnesota
Lake Superior Agate				Range in color from a light to dark salmon or coral color with alternating bands of white or light yellow.  Colorless inclusions of quartz are often present.	Northeastern Minnesota	Nebraska - Archean System
Lake Vermillion Chert					Northeastern Minnesota	Lake Vermillion Formation
Maquoketa Chert AKA: Silurian 2 Chert				Ranges in color from a pale olive gray to a pale gray.  Banding or streaking may be present.	Southeastern Minnesota	Maquoketa Formation
Oneota Chert AKA: Oneota Prairie de Chein Chert (lower)				Ranges from white to gray or yellowish or orange	Central to eastern Minnesota	Lower Prairie de Chien Group,  Oneota formation
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.	Southeastern Minnesota	Rapid Member of the Cedar Valley Formation
Red River Chert				Ranges from white to light gray or light brown and may vary from a solid color to mottled	Northwestern Minnesota
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	Southeastern Minnesota	Cedar Valley Formation, Rapid Member.
Selkirk Chert AKA: Dundee Chert				Range in color from light gray to yellowish gray, dark gray, , black or brown.  White to light gray bands or clouds are present	Northern Minnesota	Dundee Limestone Formation
Shakopee Chert				Ranges from white to gray with contrasting banding	Southeastern Minnesota	Shakopee Dolomite formation
Shell Rock Chert				Mottled white to light gray in color.  It has light gray colonial corals present.	South central Minnesota
Silver Hill Quartzite Hixton Quartzite variant					Southeastern Minnesota	Revett Formation
Sioux Jasper				Ranges in color from a brownish yellow to red	Southwestern Minnesota	Sioux Formation
Sioux Quartzite				Ranges from a light grayish tan to a medium grayish brown.	Southwestern Minnesota	Sioux Formation
Swan River Chert				Ranges from a creamy white to gray, pink to a rust, or pale yellow to deep orange, commonly has banding	Central to western Minnesota	Souris River Formation, Point Wilks Member
Tongue River Silicified Sediment				Grayish brown sediment, pseudoquartzite, or arenaceous chert	Southwestern Minnesota	Slope / Bullion Creek formation