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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Merwinite
Metaconglomerate
Mezö-Madaras
Microcline (var. amazonite)
Migmatite
Millerite
Millerite
Millerite with hematite and quartz
Missouri River Sapphires
Montana Sapphires
Muscovite schist
Nautilus Tourmaline Pendant
Nephrite Bowl
New Concord
Nifontovite
Nigerian tourmalines
Norton County
Olivine-basalt drill core
Olivine-gabbro
Opal
Opal
Opal
Opal bone
Opal replacing wood
Oregon Sunstones
Paragould
Pearl and Peridot Haircomb
Peekskill
Pegmatite
Pentahydroborite
Peridot gemstones
Peridot in Basalt
Peridotite xenolith
Peridotite xenolith in basalt
Peridotite xenoliths in basalt
Pitts
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