![](http://www.alamy.com/thumbs/6/FB8C041D-BF87-415A-8AEE-DF560E7A495F/2PD0RKN.jpg)
Turquoise is a hydrated copper and aluminum phosphate that is extensively used as a gemstone
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Photo credit: © Henri Koskinen / Alamy / Afripics
License: Royalty Free
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Keywords: blue, copper, cryptocrystalline, gemstone, geology, hydrated, kalaiitti, mineral, mineralogy, opaque, ornamental, phosphate, semi-precious, stone, thumbled, turkoosi, turquoise