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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Opal
Opal
Opal
Opal bone
Opal replacing wood
Oregon Sunstones
Paraiba Tourmaline
Paraiba Tourmaline
Paraiba Tourmaline
Paraiba Tourmaline Ring
Pearl and Peridot Haircomb
Peridot gemstones
Peridot in Basalt
Post Diamond Tiara
Prehnite
Pyromorphite
Pyrophyllite
Pyroxmangite
Quartz
Quartz
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. amethyst geode)
Quartz (var. amethyst geode)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. ametrine)
Quartz (var. citrine)
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