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'''Turquoise''' is a [[mineral]] used as a gemstone in jewelry. It has a distinctive greenish-blue color with some lighter and darker variations. It was used long ago by the Egyptians and the Aztecs, who believed turquoise had protective powers, and it is found in [[Native American]] jewelry.
'''Turquoise''' is a [[mineral]] used as a gemstone in jewelry. It has a distinctive greenish-blue color with some lighter and darker variations. It was used long ago by the Egyptians and the [[Aztecs]], who believed turquoise had protective powers, and it is found in [[Native American]] jewelry.
It is a copper aluminum [[phosphate]] with the chemical composition: CuAl<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>8</sub>·4H<sub>2</sub>O. It has a [[hardness]] rating of 5 - 6 on the [[Mohs Hardness Scale|Mohs scale]], and a specific Gravity of around 2.6 - 2.8.
It is a copper aluminum [[phosphate]] with the chemical composition: CuAl<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>8</sub>·4H<sub>2</sub>O. It has a [[hardness]] rating of 5 - 6 on the [[Mohs Hardness Scale|Mohs scale]], and a specific Gravity of around 2.6 - 2.8.