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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Albite (var. moonstone)
Amazonite
Apophyllite with prehnite
Calcite
Dolerite
Kyanite after andalusite
Limestone with chert
Opal
Opal bone
Quartz (var. amethyst)
Quinn Canyon
Roebling Opal
Sandstone
Stalagmite
Staunton
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