A 7,000 Carat Quartz Egg A 7,000 Carat Quartz Egg
Mineral Cabinet

Smithsonian Gem & Mineral Collection

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A 7,000 Carat Quartz Egg
 
From Brazil, this highly faceted rock crystal (quartz) egg is 7,000 carats! Quartz, in its many forms, colors, varieties and possible uses, is the most diverse natural substance known. Colorless or transparent quartz is called rock crystal. Smithsonian's National Museum of Natural History.
Last modified 2026-08-09 MZ Smithsonian photos by Dane A. Penland
Copyright 1992 Smithsonian Institution 		A 7,000 Carat Quartz Egg