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Smithsonian National Museum of Natural History
GeoGallery
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GeoGallery
Banded iron formation
Cape York
Folded anorthosite
Muscovite schist
Olivine-gabbro
Pyritic slate
Quartz (var. agate)
Quartz (var. amethyst)
Quartz (var. amethyst)
Quartz Gems
Tugtupite
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