peridot

peridot
—peridotic /per'i dot"ik, -doh"tik/, adj.
/per"i doh', -dot'/, n. Mineral.
a green transparent variety of olivine, used as a gem.
[1300-50; < F péridot; r. ME peritot < MF]

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or precious olivine

Gem-quality, transparent green olivine.

Very large crystals are found in Myanmar; peridots from the U.S. are seldom larger than two carats. Yellow-green peridot has been called chrysolite (Greek for "golden stone"); this term, used for various unrelated minerals, is now less common for the gemstone.

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also called  precious olivine 

      gem-quality, transparent green olivine in the forsterite–fayalite series (forsterite-fayalite series) (q.v.). Gem-quality olivine has been valued for centuries; the deposit on Jazīrat Zabarjad (Saint Johns Island), Egypt, in the Red Sea that is mentioned by Pliny in his Natural History (AD 70) still produces fine gems. Very large crystals are found in the Mogok district of Myanmar (Burma); peridots from the United States are seldom larger than two carats. Yellow-green peridot has been called chrysolite (Greek: “golden stone”); this term, used for various unrelated minerals, has become less common for the gemstone. Peridot is generally faceted with a step cut.

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