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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Lawsonite
Limestone
Limestone with chert
Lost City meteorite
Manganoan calcite
Marble with wollastonite
Marcasite
Merwinite
Metaconglomerate
Microcline (var. amazonite)
Migmatite
Millerite
Millerite
Millerite with hematite and quartz
Mimetite
Missouri River Sapphires
Montana Sapphires
Muscovite schist
Nephrite Bowl
New Concord
Norton County
Nuevo Mercurio
Olivine-basalt drill core
Olivine-gabbro
Opal
Opal
Opal
Opal (var. hyalite)
Opal bone
Opal in matrix
Opal replacing wood
Opals
Oregon Sunstones
Orthoclase (var. adularia) with dolomite
Paradamite with pharmacosiderite
Paragould
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