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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Limestone with chert
Lost City meteorite
Malachite
Malachite slab
Manganoan calcite
Marble with wollastonite
Marcasite
Marquise Diamond Ring
Merwinite
Metaconglomerate
Metatorbernite
Microcline (var. amazonite)
Migmatite
Millerite
Millerite
Millerite with hematite and quartz
Missouri River Sapphires
Montana Sapphires
Muscovite schist
Nephrite Bowl
New Concord
Norton County
Olivine-basalt drill core
Olivine-gabbro
Opal
Opal
Opal
Opal bone
Opal replacing wood
Oppenheimer Diamond
Oregon Sunstones
Paragould
Pearl and Peridot Haircomb
Pearson Diamond
Peekskill
Pegmatite
Pagination
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