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Chrysoprase

Chrysoprase is one of the Star Signs for Gemini.

The gemstone Chrysoprase is an opalescent apple green colored variety of chalcedony (quartz). Most green stones owe their color to chromium or vanadium, but chrysoprase derives its color from the nickel content. It is found in Australia, Brazil, the Ural Mountains, and the U.S. and is the rarest of the chalcedony group.

Chrysoprase was used by the Greeks, Romans, and the Egyptians in jewelry and other ornamental objects and because of its semi-opaque green color, it is often mistaken for Imperial jadeite.  One of the most valuable chalcedony gem stones, chrysoprase is prized for its color and rarity, it is a 7 on the Mohs scale of hardness.