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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Agate
Azurite
Bismuth
Calcite
Diamond in kimberlite
Fluorite with calcite
Gypsum
Gypsum
Gypsum
Hematite with quartz
Hemimorphite
Mimetite
Opal in matrix
Oppenheimer Diamond
Orthoclase (var. adularia) with dolomite
Paradamite with pharmacosiderite
Paravauxite
Purple agate
Pyrite
Pyrite with calcite
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. amethyst)
Rhodochrosite
Scorodite
Sinuous Gypsum
Sugilite
Vivianite with pyrite
Wulfenite
Wulfenite
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