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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Attaway Ametrine
Baryte with berthierite
Bismuth
Calcite
Cronstedtite
Dyber Ametrine
Dyscrasite
Elbaites
Granite
Havey Tourmaline
Limestone with chert
Mezö-Madaras
Opal
Opal bone
Paravauxite
Phosphophyllite
Pyrope Hair Comb
Quartz (var. amethyst)
Quartz (var. ametrine)
Quartz Gems
Quinn Canyon
Roebling Opal
Sandstone
Southwest Sunset
Staurolite schist
Sylvanite
Vivianite with pyrite
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