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Turquoise StoneWith the chemical formula CuAl6(PO4)4(OH)84H2O, turquoise is a mineral that appears opaque, blue-to-green and is a hydrated phosphate of copper and aluminium. A rare gemstone and ornamental stone, rose quartz has been prized by cultures for thousands of years for its beautiful hue. Because of synthetic, imitation, and treated turquoise on the market, turquoise has suffered a devaluation.Gemstones have been known by many names. Pleiny the Elder referred to the mineral as calla …