Amethyst
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Amethyst is a violet variety of natural quartz. Ancient Greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication. Amethyst, a semiprecious stone, is of
Amethyst cluster from Artigas, Uruguay
Natural purple/violet amethyst
Heat-treated amethyst
Main amethyst-producing countries
Quartz
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Quartz is a hard mineral composed of silica. Its atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen atom being shared between two tetrahedra, giving an over
Amethyst
…Amethyst is a violet variety of natural quartz. Ancient Greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication. Amethyst, a semiprecious stone, is…
Quartz crystal cluster from Brazil
Common, prismatic quartz
Sceptered quartz
Sceptered quartz (as aggregates: "Elestial quartz")