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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Manganoan calcite
Marcasite
Merwinite
Microcline (var. amazonite)
Millerite
Millerite
Millerite with hematite and quartz
Missouri River Sapphires
Montana Sapphires
Nephrite Bowl
Opal
Opal
Opal
Opal bone
Opal replacing wood
Orbicular agate
Oregon Sunstones
Orthoclase
Pearl and Peridot Haircomb
Peridot gemstones
Peridot in Basalt
Prehnite
Pyromorphite
Pyrophyllite
Quartz
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. amethyst)
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