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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Actinolite
Arkose
Augen gneiss block
Basaltic cinder
Columnar dacite
Diaspore
Diaspore
Fluorite with calcite
Fluorites
Freedom Diamond
Hemimorphite
Johnstown
Manganoan calcite
Microcline (var. amazonite)
Migmatite
Pyrite
Quartz (var. agate)
Quartz (var. smoky quartz) with microcline
Rhodochrosite
Sphalerite
Unusual Gems
Zircon (var. cyrtolite)
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