Turquoise

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Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula CuAl6(PO4)4(OH)8ยท4H2O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. In recent times, turquoise, like most other opaque gems, has been devalued by the introduction of treatments, imitations, and synthetics onto the market.

The substance has been known by many names, but the word turquoise, which dates to the 17th century was derived from the French language turques, because it was first brought to Europe from Turkey from the mines in Persia.[2][3][4][5] Pliny referred to the mineral as callais and the Aztecs knew it as chalchihuitl.[4]

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