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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Adamite
Arkose
Augen gneiss block
Basaltic cinder
Conchita Montana Sapphire Butterfly
Corundum (var. sapphire)
Hemimorphite
Hubnerite with quartz
Johnstown
Kyanite schist
Manganoan calcite
Microcline
Microcline (var. amazonite)
Migmatite
Missouri River Sapphires
Montana Sapphires
Opal
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. smoky quartz) with microcline
Rhodochrosite
Rhodochrosite with arsenopyrite
Rhodochrosite with quartz
Rhodonite
Rock Creek Sapphires
Tetrahedrite
Veszelyite
Zircon (var. cyrtolite)
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