turquoise
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turquoise
What does it mean when you dream about turquoise?
A precious stone of blue and green mined by Native Americans throughout the southwestern United States, the turquoise has spiritual significance. It is the sacred stone of the Navajo associated with natural forces and healing.
turquoise
[′tər‚kwȯiz]turquoise
turquoise
Turquoise
a mineral of the chemical composition CuAl6[P04]4(OH)8·4H2O. It crystallizes in a tricline system. It usually forms compact, cryptocrystalline masses, kidney-shaped aggregates, incrustations, thin veins, and so on. Its hardness on the mineralogical scale is 5–6; its density is 2,600–2,800 kg/m3. The luster is dull and waxy. It is distinguished by a beautiful sky-blue or greenish-blue color. The formation of turquoise is associated with the weathering of feldspar rocks rich in Al2O3 and phosphates (apatite, phosphorite, and others) under the influence of surface waters that contain copper ions. Turquoise is sometimes formed by the replacement of parts of the skeleton of fossil animals (so-called odontolite). Owing to its beautiful color (particularly in polished form), it is widely used in art and jewelry items as a semiprecious stone. The largest deposit of turquoise is at Nishapur in Iran. In the USSR, turquoise is found in Middle Asia and Kazakhstan.
G. P. BARSANOV