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Quartz (variety: Rock Crystal)

This 7, 478 carat faceted (240 facets) quartz egg, created by John Sinkankas, originated in Brazil. The metal base is set with 16 small and 4 larger sapphires. Under ideal conditions, in spacious cavities or other openings in rock, quartz crystals can grow impressively large, sometimes weighing several tons. Clear colorless quartz, called rock crystal, is the most common gem mineral. Most commonly, rock crystal is used for carvings, chandeliers, and crystal balls. This quartz egg is an outstanding example of the gem cutter's art and is the largest faceted quartz in the National Gem Collection.

Image Number: 96-30200
Catalog Number: G03957
Weight: 7, 478 carats
Exchange: J. Sinkankas , 1964

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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits