Minerals from Midwest, USA

Gypsum var. Selenite from Hutchinson County, South Dakota

Gypsum var. Selenite from Ellsworth, Mahoning County, Ohio

Gypsum var. Selenite from Hutchinson County, South Dakota

Gypsum var. Selenite from Great Salt Plains, near Jet, Alfalfa County, Oklahoma

Gypsum var. Selenite Twins from Lemmon, Perkins County, South Dakota

Gypsum var. Selenite with hour-glass shaped zoning from Great Salt Plains, near Jet, Alfalfa County, Oklahoma

Gypsum var. Selenite with hour-glass shaped zoning from Great Salt Plains, near Jet, Alfalfa County, Oklahoma

Gypsum var. Selenite with hour-glass shaped zoning from Great Salt Plains, near Jet, Alfalfa County, Oklahoma

Gypsum var. Selenite with hour-glass shaped zoning from Great Salt Plains, near Jet, Alfalfa County, Oklahoma

Gypsum var. Selenite with internal zoning from Great Salt Plains, near Jet, Alfalfa County, Oklahoma

Halite from Detroit, Michigan

Halite from Cleveland, Cuyahoga County, Ohio

Hematite from Isabella Mine, Palmer, Marquette County, Michigan

Hematite from Ishpeming, Marquette County, Michigan

Hematite from Soudan Iron Mine, Soudan, St. Louis County, Minnesota

Hematite from Ishpeming, Marquette County, Michigan

Hematite from Newport Mine, Ironwood District, Gogebic County, Michigan

Hematite from Ishpeming, Marquette County, Michigan

Hematite from Iron Mining District, Marquette and Iron Counties, Michigan

Hematite from Ishpeming, Marquette County, Michigan

Hematite and Quartz from Isabella Mine, Palmer, Marquette County, Michigan

Hematite on Quartz from Republic Mine, Marquette County, Michigan

Hematite var. Blue Steel Ore from Cary Mine, Iron County, Wisconsin

Hematite var. Flowstone from Route 67 road cut, near Arkadelphia, Clark County, Arkansas

Hematite var. Grape Ore from Superior Mine, Marquette, Michigan

Hematite var. Kidney Ore from Montreal Mine, Gogebic Iron Range, Iron County, Wisconsin

Hematite var. Pipe Ore from Jackson Iron Mine, Jackson County, Wisconsin

Hematite var. Specular from Humboldt Mine, Marquette County, Michigan

Hematite var. Velvet Kidney Ore from Lucy Mine, Negaunee, Marquette County, Michigan

Hematite, Chalcopyrite, Calcite from Pea Ridge Mine, Washington County, Missouri

Hematite-Limonite from Menominee Range, near Iron City, Dickinson County, Michigan

Hemimorphite on Dolomite from Mattie Mae Mine, Rush Creek District, Marion County, Arkansas

Hemimorphite var. Calamine from Granby, Newton County, Missouri

Hemimorphite var. Calamine from Granby, Newton County, Missouri

Hemimorphite var. Calamine from Oronogo Mutual Mine, Tri-State Lead Mining District, Jasper County, Missouri

Honessite from Hall's Gap, Lincoln County, Kentucky

Honessite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Honessite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Honessite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Honessite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Honessite on Millerite from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Honessite on Millerite from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Honessite with Pyrite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Hoploscaphites Cheyennensis and Sphenodiscus Lenticularis Fossil from Fox Hills Formation, Pennington County, South Dakota

Hoploscaphites Fossil from Cretaceous - 100 million years old, Pierre Formation, Montana

Hoploscaphites Fossil from Fox Hills, South Dakota

Hoploscaphites Fossil from Fox Hills, South Dakota

Hoploscaphites Fossil from Fox Hills Formation, Pennington County, South Dakota

Hoploscaphites Nicoletti Fossil from Fox Hills, South Dakota

Hureaulite with Jahnsite from Tip Top Mine, Custer District, Custer County, South Dakota

Ilmenite from Republic Mine, Marquette County, Michigan

Iron Meteorite from Crystal Lake, Iowa

Iron Pallasite Meteorite from Brenham, Kiowa County, Kansas

Ixiolite from Helen Beryl Mine, Custer District, Custer County, South Dakota

Jamborite pseudomorphs after Millerite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Jamborite pseudomorphs after Millerite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Jamborite pseudomorphs after Millerite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Jamborite pseudomorphs after Millerite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Jamborite pseudomorphs after Millerite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Jarosite from Richmond-Sitting Bull Mine, Galena District, Lawrence County, South Dakota

Jarosite from Richmond-Sitting Bull Mine, Galena District, Lawrence County, South Dakota

Jarosite (3 pieces) from Richmond-Sitting Bull Mine, Galena District, Lawrence County, South Dakota

Kidwellite, Beraunite, Cacoxenite, Goethite from Coon Creek Mine, Polk County, Arkansas

Kidwellite, Cacoxenite, Beraunite from Coon Creek Mine, Polk County, Arkansas

Kleinite, Terlinguaite, Edgarbaileyite from Terlingua District, Brewster County, Texas (Type Locality for Kleinite and Terlinguaite)

Ktenasite on Gypsum pseudomorph after Calcite from Tri-State Lead-Zinc Mining District, near Joplin, Jasper County, Missouri

Leadhillite from Beer Cellar Mine, Granby, Newton County, Missouri

Lepidolite-2M from Black Hills, South Dakota

Leucophosphite and Hureaulite from Tip Top Mine, Custer District, Custer County, South Dakota

Limonite pseudomorphs after Marcasite from Potosi, Washington County, Missouri

Limonite pseudomorphs after Pyrite on Quartz from Boscobel, Grant County, Wisconsin

Limonite Stalactite from Leonidas Mine, Butte Mining District, Summit Valley, Silver Bow County, Minnesota

Limonite Stalactite from Negaunee Iron Mining District, Marquette County, Michigan

Löllingite from Ingersoll Mine, Keystone District, Pennington County, South Dakota

Löllingite var. Leucopyrite from Keystone District, Pennington County, South Dakota

Löllingite with Elbaite Tourmaline in Albite from Ingersoll Mine, Keystone District, Pennington County, South Dakota

Magnetite from Magnet Cove, Hot Spring County, Arkansas

Magnetite from Perovskite Hill, Magnet Cove, Hot Spring County, Arkansas

Magnetite and Brookite on Smoky Quartz from Magnet Cove, Hot Spring County, Arkansas

Magnetite pseudomorph after Garnet from Champion Mine, Ishpeming, Michigan

Magnetite with siliceous banding (Taconite formation) from Mesabi Range, Minnesota

Magnetite with siliceous banding (Taconite formation) from Mesabi Range, Minnesota

Magnetite with siliceous banding (Taconite formation) from Mesabi Range, Minnesota

Magnetite with siliceous banding (Taconite formation) from Mesabi Range, Minnesota

Malachite from east of Paoli, Garvin County, Oklahoma

Malachite on Calcite from Victory Mine, Cave-in-Rock District, Hardin County, Illinois

Malachite on Calcite from Victory Mine, Cave-in-Rock District, Hardin County, Illinois

Manganite from (Lucy Mine), Negaunee District, Marquette County, Michigan

Manganite from Ironwood, Gogebic Range, Gogebic County, Michigan

Manganite from Montreal Mine, Gogebic Iron Range, Iron County, Wisconsin

Manganite on Hematite from Negaunee Iron District, Marquette County, Michigan

Marcasite from Rensselaer Quarry, Pleasant Ridge, 6 km east of Rensselaer, Jasper County, Indiana

Marcasite from Shullsburg District, Lafayette County, Wisconsin

Marcasite from Shullsburg District, Lafayette County, Wisconsin

Marcasite from Ives Quarry, Racine, Wisconsin

Marcasite from Tri-State Lead-Zinc Mining District, near Joplin, Jasper County, Missouri

Marcasite from Rensselaer Quarry, Pleasant Ridge, 6 km east of Rensselaer, Jasper County, Indiana

Marcasite from Rensselaer Quarry, Pleasant Ridge, 6 km east of Rensselaer, Jasper County, Indiana

Marcasite from Eagle Picher Mine, Shullsburg District, Lafayette County, Wisconsin

Marcasite from Galena, Cherokee County, Kansas

Marcasite from Tri-State Lead-Zinc Mining District, near Joplin, Jasper County, Missouri

Marcasite from Shullsburg District, Lafayette County, Wisconsin

Marcasite from Magmont Mine, Bixby, Iron County, Missouri

Marcasite from Mineral Point District, Iowa County, Wisconsin

Marcasite from Mineral Point District, Iowa County, Wisconsin

Marcasite and Dolomite from Sweetwater Mine, Viburnum Trend, Reynolds County, Missouri

Marcasite and Pyrite from Lutz Quarry, Oshkosh, Winnebago County, Wisconsin

Marcasite and Pyrite on Sphalerite from Mid-Continent Mine, Treece, Cherokee County, Kansas

Marcasite and Sphalerite on Galena from Mid-Continent Mine, Picher, Ottawa County, Oklahoma

Marcasite in Gypsum var. Selenite from Kanopolis Lake Dam, Ellsworth County, Kansas

Marcasite in Quartz var. Agate from Nipomo, San Luis Obispo County, California

Marcasite intersecting stalactitic formations from Linwood Mine, Buffalo, Scott County, Iowa

Marcasite on Calcite from Shullsburg District, Lafayette County, Wisconsin

Marcasite on Calcite from Fogle Quarry, Ottawa, Franklin County, Kansas

Marcasite on Calcite from Brushy Creek Mine, Viburnum Trend, Reynolds County, Missouri

Marcasite on Calcite from Brushy Creek Mine, Viburnum Trend, Reynolds County, Missouri

Marcasite on Calcite in fossil from Fogle Quarry, Ottawa, Franklin County, Kansas

Marcasite on Dolomite from Tri-State Lead-Zinc Mining District, near Joplin, Jasper County, Missouri

Marcasite on Galena from Mid-Continent Mine, Picher, Oklahoma

Marcasite on Galena from Baxter Springs, Kansas

Marcasite on Galena from Magmont Mine, Bixby, Iron County, Missouri

Marcasite on Galena from Buick Mine, Bixby, Viburnum Trend, Iron County, Missouri

Marcasite on Galena from Mid-Continent Mine, Picher, Ottawa County, Oklahoma

Marcasite on Galena from Picher, Ottawa County, Oklahoma

Marcasite on Galena from Tri-State Lead-Zinc Mining District, near Joplin, Jasper County, Missouri

Marcasite on Galena with Anglesite coating from Viburnum Trend, Reynolds County, Missouri

Marcasite on Sphalerite from Tri-State Lead-Zinc Mining District, near Joplin, Jasper County, Missouri

Marcasite on Sphalerite from Cherokee County, Kansas

Marcasite on Sphalerite from Blackstone Mine, Shullsburg District, Lafayette County, Wisconsin

Marcasite pseudomorphs after Anhydrite with Galena and Calcite from Sweetwater Mine, Viburnum Trend, Reynolds County, Missouri

Marcasite pseudomorphs after Calcite from Tri-State Lead-Zinc Mining District, near Joplin, Jasper County, Missouri

Marcasite Stalactite with Galena from Sweetwater Mine, Viburnum Trend, Reynolds County, Missouri

Marcasite with Barite from Pint's Quarry, Raymond, Black Hawk County, Iowa

Marcasite with Calcite from Blackstone Mine, Shullsburg District, Lafayette County, Wisconsin

Marcasite with Calcite from Sweetwater Mine, Viburnum Trend, Reynolds County, Missouri

Marcasite with Calcite from Bellevue Quarry, Eaton County, Michigan

Marcasite with Quartz overgrowth from attributed to Viburnum Trend, Reynolds County, Missouri

Marcasite with Selenite from Kanopolis Lake Dam, Kanopolis, Kansas

Millerite from Halls Gap, Kentucky

Millerite from U.S. Highway 27 road cut, Halls Gap, Lincoln County, Kentucky

Millerite from Eastabrook Park, Milwaukee County, Wisconsin

Millerite from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Millerite from Ollie Quarry, Keokuk County, Iowa

Millerite from Estabrook Park, Milwaukee, Milwaukee County, Wisconsin

Millerite (with twisted spiral crystals) in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Millerite and Marcasite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Millerite and Marcasite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Millerite and Marcasite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Millerite and Marcasite in Quartz Geode from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky

Millerite and Pyrite from US Route 27 road cut, Halls Gap, Lincoln County, Kentucky