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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
African Gems
Arkose
Augen gneiss block
Baryte
Basaltic cinder
Beryl
Beryl (var. emerald)
Beryl (var. heliodor)
Bununu
Calcite
Corundum (var. sapphire)
Elbaite
Elbaite
Elbaite
Elbaite
Elbaite (var. rubellite)
Fluorite
Fluorite
Fluorites
Freedom Diamond
Hematite
Hemimorphite
Johnstown
Kyanite with biotite
Manganoan calcite
Microcline (var. amazonite)
Migmatite
Nautilus Tourmaline Pendant
Nigerian tourmalines
Quartz (var. agate)
Quartz (var. smoky quartz) with microcline
Rhodochrosite
Spessartine
Weston
Zagami
Zircon (var. cyrtolite)
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