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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Opal
Phosgenite
Quartz (var. dendritic agate)
Rhodochrosite
Rhodochrosite with quartz
Rhodonite
Shergotty
Smithsonite
Spessartine
Tennantite
Tetrahedrite
Unusual Gems
Wulfenite
Zagami
Pagination
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