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Smithsonian National Museum of Natural History
GeoGallery
Breadcrumb
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GeoGallery
Banded iron formation
Demantoid with serpentine
Gypsum with sulphur
Imilac
Imilac
Limestone with chert
North Chile
Olivine-gabbro
Opal
Opal bone
Phosgenite
Proustite cross (NMNH 12829-00)
Quartz (var. agate)
Quartz (var. amethyst)
Quinn Canyon
Roebling Opal
Sandstone
Sulfur
Unusual Gems
Vigarano
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