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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Arkose
Augen gneiss block
Banded iron formation
Basaltic cinder
Beryl
Beryl (var. heliodor)
Bununu
Calcite on galena
Corundum (var. sapphire)
Elbaite
Elbaite
Elbaite
Elbaite (var. rubellite)
Halite
Halite
Hemimorphite
Hubnerite with quartz
Johnstown
Manganoan calcite
Microcline
Microcline (var. amazonite)
Migmatite
Nautilus Tourmaline Pendant
Nigerian tourmalines
Olivine-gabbro
Opal
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. smoky quartz) with microcline
Rhodochrosite
Rhodochrosite with quartz
Rhodonite
Tetrahedrite
Zagami
Zircon (var. cyrtolite)
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