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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Baryte with berthierite
Basalt drill core
Basalt drill core
Basalt drill core
Cronstedtite
Estherville meteorite
Homestead
Limestone with chert
Mezö-Madaras
Olivine-basalt drill core
Opal
Opal bone
Peridotite xenoliths in basalt
Quartz (var. amethyst)
Quinn Canyon
Roebling Opal
Rose City
Sandstone
Sylvanite
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