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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Platinum nugget
Prehnite
Pyritic slate
Pyromorphite
Pyromorphite
Pyrophyllite
Pyrrhotite
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. landscape agate)
Quartz (var. smoky quartz) with microcline
Quartz Gems
Quartz Pendant
Quinn Canyon
Rhodochrosite
Rhodochrosite with arsenopyrite
Rhyolite
Rhyolite pumice
Rock Creek Sapphires
Roebling Opal
Rose City
Russian beryls
Russian chrysoberyls
Sandstone
Sandstone
Scheelite
Sikhote-Alin
Smithsonite
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