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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Millerite
Millerite with hematite and quartz
Missouri River Sapphires
Muscovite schist
Olivine-basalt drill core
Olivine-gabbro
Opal bone
Opal in matrix
Opal replacing wood
Pegmatite
Peridot in Basalt
Peridotite xenolith
Peridotite xenolith in basalt
Peridotite xenoliths in basalt
Prehnite
Pyritic slate
Pyromorphite
Pyrophyllite
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz (var. landscape agate)
Quartz (var. smoky quartz) with microcline
Rhodochrosite
Rhyolite
Rhyolite pumice
Rock Creek Sapphires
Roebling Opal
Sandstone
Sandstone
Smithsonite
Smithsonite
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