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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Opal
Opal
Opal
Opal
Opal
Opal
Opal (var. hyalite)
Opal bone
Opal in matrix
Opal Peacock Brooch
Opal replacing wood
Opal vertebra
Opals
Oppenheimer Diamond
Orbicular agate
Oregon Sunstones
Orgueil meteorite
Orthoclase
Orthoclase (var. adularia)
Orthoclase (var. adularia) with dolomite
Owl Brooch
Paradamite with pharmacosiderite
Paragould
Paraiba Tourmaline
Paraiba Tourmaline
Paraiba Tourmaline
Paraiba Tourmaline Ring
Paravauxite
Parisite with calcite
PAT 91501,5
PAT 91501,50
Pearl and Diamond Ring
Pearl and Peridot Haircomb
Pearson Diamond
Peekskill
Pegmatite
Pagination
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