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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Amphibole-rock
Arkose
Attaway Ametrine
Augen gneiss block
Basaltic cinder
Bismuth
Dyber Ametrine
Garnetiferous schist
Granite block
Hemimorphite
Johnstown
Limestone with chert
Manganoan calcite
Microcline
Microcline (var. amazonite)
Migmatite
Opal
Opal bone
Paravauxite
Pegmatite
Phosphophyllite
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. ametrine)
Quartz (var. smoky quartz) with microcline
Quartz Gems
Quinn Canyon
Rhodochrosite
Roebling Opal
Rose City
Sandstone
Southwest Sunset
Vivianite with pyrite
Zircon (var. cyrtolite)
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