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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Agate
Azurite
Baryte
Baryte with calcite
Calcite
Gypsum
Gypsum
Gypsum
Hemimorphite
Millerite
Millerite with hematite and quartz
Mimetite
Opal in matrix
Opal replacing wood
Orthoclase (var. adularia) with dolomite
Paradamite with pharmacosiderite
Purple agate
Pyrite with calcite
Pyromorphite
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. amethyst)
Scorodite
Sinuous Gypsum
Wulfenite
Wulfenite
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