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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Arkose
Augen gneiss block
Basaltic cinder
Cape York
Ensisheim
Folded anorthosite
Hemimorphite
Johnstown
Juvinas
Limestone with chert
Manganoan calcite
Microcline
Microcline (var. amazonite)
Migmatite
Opal
Opal bone
Orgueil meteorite
Pyromorphite
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. smoky quartz) with microcline
Quartz on siderite
Quinn Canyon
Rhodochrosite
Roebling Opal
Sandstone
Staurolite
Tugtupite
Zircon (var. cyrtolite)
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