Moonstone gemstones

Moonstone gemstones

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Credit: LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY

Caption: Moonstone gemstones. This orthoclase mineral (potassium aluminium silicate) has been cut and polished to produce semi-precious gemstones. It belongs to the feldspar group of minerals, which are related due to symmetry and composition. Feldspars make up 60% of the earth's outer crust. Moonstone is named due to its moon-like glow, which results from the refraction of light between internal layers before exiting the crystal.

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Keywords: adularia, blurred, cut, earth science, feldspar, gem, gems, gemstone, gemstones, geology, many, mineral, moonstone, moonstones, multiple, natural, orthoclase, out of focus, polished, potassium aluminium silicate, semi-precious, stone, stones

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