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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Almandine schist
Demantoid with serpentine
Gypsum with sulphur
Nakhla
Opal
Opal
Opal replacing wood
Peridot gemstones
Phosgenite
Pyromorphite
Sulfur
Unusual Gems
Vigarano
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