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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Attaway Ametrine
Bismuth
Calcite
Dyber Ametrine
Hubnerite with quartz
Kyanite
Kyanite
Limestone with chert
Opal
Opal
Opal bone
Paravauxite
Phosphophyllite
Quartz (var. amethyst)
Quartz (var. ametrine)
Quartz Gems
Quinn Canyon
Rhodochrosite with quartz
Rhodonite
Roebling Opal
Sandstone
Southwest Sunset
Tetrahedrite
Vivianite with pyrite
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