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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Arkose
Augen gneiss block
Basaltic cinder
Conchita Montana Sapphire Butterfly
Corundum (var. sapphire)
Ensisheim
Freedom Diamond
Hemimorphite
Johnstown
Juvinas
Kyanite schist
Limestone with chert
Manganoan calcite
Microcline (var. amazonite)
Migmatite
Missouri River Sapphires
Montana Sapphires
Opal
Opal bone
Orgueil meteorite
Pyromorphite
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. smoky quartz) with microcline
Quartz on siderite
Quinn Canyon
Rhodochrosite
Rock Creek Sapphires
Roebling Opal
Sandstone
Staurolite
Veszelyite
Zircon (var. cyrtolite)
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