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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Calcite
Chinguetti
Elbaites
Fluorites
Granite
Havey Tourmaline
Marble with wollastonite
Millerite
Millerite with hematite and quartz
Opal
Opal
Opal replacing wood
Peekskill
Pyromorphite
Staurolite schist
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