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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Arkose
Augen gneiss block
Banded iron formation
Basaltic cinder
Estherville meteorite
Hemimorphite
Homestead
Imilac
Imilac
Johnstown
Manganoan calcite
Microcline
Microcline (var. amazonite)
Migmatite
North Chile
Olivine-gabbro
Proustite cross (NMNH 12829-00)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. smoky quartz) with microcline
Rhodochrosite
Zircon (var. cyrtolite)
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