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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Olivine-gabbro
Opal
Opal
Opal
Opal (var. hyalite)
Opal bone
Opal in matrix
Opal replacing wood
Opals
Oregon Sunstones
Orthoclase (var. adularia) with dolomite
Paradamite with pharmacosiderite
Paragould
Pearl and Peridot Haircomb
Peekskill
Pegmatite
Peridot gemstones
Peridot in Basalt
Peridotite xenolith
Peridotite xenolith in basalt
Peridotite xenoliths in basalt
Perovskite
Pitts
Plainview
Plantersville
Platinum nugget
Prehnite
Purple agate
Pyrite with calcite
Pyritic slate
Pyromorphite
Pyrophyllite
Pyrrhotite
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Pagination
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