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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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