Topaz gemstones

Topaz gemstones

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Credit: LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY

Caption: Topaz gemstones. This silicate mineral (aluminium silicate fluoride hydroxide) can range in colour from golden brown to yellow. Topaz can be polished in a variety shapes; the opposed bar is seen here. On the Mohs hardness scale it is rated 8 out of 10, with diamond at number 10. It is mined across the world, with notable occurrences in Brazil and Russia.

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Keywords: aluminium silicate, coloured, cut, earth science, fluoride hydroxide, gem, gems, gemstone, gemstones, geology, mineral, natural, pile, polished, stack, stone, stones, topaz

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