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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Baryte with berthierite
Cronstedtite
Elbaites
Granite
Havey Tourmaline
Limestone with chert
Mezö-Madaras
Nakhla
Opal
Opal bone
Peridot gemstones
Quartz (var. amethyst)
Quinn Canyon
Roebling Opal
Sandstone
Staurolite schist
Sylvanite
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