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Smithsonian National Museum of Natural History

Quartz (var. smoky-citrine)

Photograph of large smoky quartz crystals (166840) from the National Mineral Collection
Photo by Chip Clark. Click to zoom.
Catalog Number NMNH 166840-00
Locality Sapucaia Mine, Minas Gerais, Brazil

From the exhibit

These two gem quality crystals have the six sided pencil shape typical of quartz. Together they weigh a whopping 52.6 kg (117 lb). If you look closely, you can see smaller crystals growing on their surfaces.

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