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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Conchita Montana Sapphire Butterfly
Corundum (var. sapphire)
Fluorite
Kyanite schist
Limestone with chert
Missouri River Sapphires
Montana Sapphires
Nifontovite
Opal
Opal bone
Pentahydroborite
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. amethyst)
Quinn Canyon
Rock Creek Sapphires
Roebling Opal
Sandstone
Schneider Tanzanite Ring
Stibnite
Topaz Gems
Veszelyite
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