Turquoise gemstone

Turquoise gemstone

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Credit: LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY

Caption: Turquoise gemstone. Close-up of the veins within turquoise (hydrated copper aluminium phosphate), the most valuable non-transparent gemstone. Its name, although now related to its colour, comes from a French word for stone of Turkey. Turquoise gems may include impurities producing other colours, such as green. It has been prized as a gemstone since ancient times, with examples found from 6000 BC.

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Keywords: aluminium phosphate, close-up, cut, earth science, gem, gemstone, geology, hydrated copper, macrophotograph, mineral, natural, polished, stone, turquoise

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