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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Amphibole-rock
Arkose
Augen gneiss block
Basaltic cinder
Conchita Montana Sapphire Butterfly
Corundum (var. sapphire)
Freedom Diamond
Garnetiferous schist
Granite block
Hemimorphite
Johnstown
Kyanite schist
Manganoan calcite
Microcline (var. amazonite)
Migmatite
Missouri River Sapphires
Montana Sapphires
Muscovite schist
Pegmatite
Pyritic slate
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. smoky quartz) with microcline
Rhodochrosite
Rock Creek Sapphires
Veszelyite
Zircon (var. cyrtolite)
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