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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Banded iron formation
Gypsum
Limestone with chert
Lost City meteorite
Olivine-gabbro
Opal
Opal bone
Quartz (var. agate)
Quartz (var. amethyst)
Quinn Canyon
Roebling Opal
Sandstone
Sphalerite
Unusual Gems
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