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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Gypsum
Gypsum
Hemimorphite
Hemimorphite
Hologem Fire Opal Pendant
Mimetite
Muscovite schist
Nautilus Tourmaline Pendant
Nigerian tourmalines
Nuevo Mercurio
Opal
Opal
Opal
Opal
Opal
Opal (var. hyalite)
Opal in matrix
Opals
Orthoclase (var. adularia) with dolomite
Paradamite with pharmacosiderite
Peridot gemstones
Peridot in Basalt
Peridotite xenolith
Peridotite xenolith in basalt
Purple agate
Pyrite with calcite
Pyritic slate
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. landscape agate)
Scorodite
Sinuous Gypsum
Smithsonite
Smithsonites
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