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Chemical Formula: CuAl6(PO4)4(OH)8·.4H2O
Mineral Name: Turquoise
Color: Light to brilliant bluish green
Hardness: 5
Specific Gravity: 2.60 - 2.83

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Turquoise is a blue to blue-green mineral of aluminum and copper, mainly, prized as a gemstone in its polished blue form. It derives its name from turc (Turkish in French) as it was transported to Europe through Turkey. It is one of the oldest known gem materials. Turquoise is a secondary mineral deposited from circulating waters, and it occurs chiefly as an opaque, granular vein running through a host rock. Ancient manuscripts from Persia, India, Afghanistan, and Arabia report that the health of a person wearing turquoise can be assessed by variations in the color of the stone and was also thought to promote prosperity.

Turquoise is an important ornamental mineral for jewelry and adorned the ceremonial dress of early native Americans. It is believed that the gemstone guards against diseases and assists in tissue regeneration, subtle body alignment and strengthening. It also brings good fortune and attracts healing spirits. Delicate veining, caused by impurities, is desired by some collectors as proof of a natural stone. Rich deposits of turquoise are found in the regions of Iran, southwestern United States, Africa, Australia, Tibet, China, Siberia and Europe.