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Chemical composition -- Hydrated copper aluminum phosphate.

Color-- Blue, green, blue-green.

Optics -- R.I. 1.62.

Durability -- Hardness 5-6.

Crystal structure -- Triclinic(massive).

Specific Gravity-- 2.6-2.9.

Sources -- Iran (Persia), Tibet, China, Egypt, southwestern U.S.

Turquoise has been widely used in Native American jewelry, inlays, and carvings. Much of the mass-market material has been permeated with resin and other substances to seal porous material and to improve color. Very fine, untreated material is fairly scarce.

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