Turquoise gemstones

Turquoise gemstones

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Credit: LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY

Caption: Turquoise gemstones. Turquoise (hydrated copper aluminium phosphate) is 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 contain impurities producing other colours, such as green. It has been prized as a gemstone since ancient times, with examples found in early Egyptian jewellery from 6000 BC.

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Keywords: aluminium phosphate, cut, earth science, gem, gems, gemstone, gemstones, geology, hydrated copper, many, mineral, multiple, natural, polished, stone, stones, turquoise

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