Amethyst

Amethyst

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Credit: PAUL BIDDLE/SCIENCE PHOTO LIBRARY

Caption: Amethyst. The specimen at left is in its natural state, the specimen at bottom right has been polished and the specimen at top right had been cut and polished. Amethyst is a variety of quartz, (silicon dioxide). The purple colour is caused by the presence of compounds of iron or manganese.

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Keywords: amethyst, black background, crystal, crystals, cut, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, gem, gemstone, geological, geology, mineral, mineralogy, natural, polished, purple, quartz, raw, silicate, silicon dioxide, specimen, specimens, still life, still-life, stone, unpolished

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