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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Agate
Ahumada
Azurite
Banded iron formation
Basalt
Calcite
Calcite
Calcite
Calcite
Carbo
Fire Opal
Fire Opal
Fluorites
Gypsum
Gypsum
Gypsum
Hemimorphite
Hemimorphite
Hologem Fire Opal Pendant
Marble with wollastonite
Millerite
Millerite with hematite and quartz
Mimetite
Muscovite schist
Nuevo Mercurio
Olivine-gabbro
Opal (var. hyalite)
Opal in matrix
Opals
Orthoclase (var. adularia) with dolomite
Paradamite with pharmacosiderite
Peekskill
Purple agate
Pyrite with calcite
Pyritic slate
Quartz (var. agate)
Pagination
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