Polished Carnelian Gemstone

Polished Carnelian Gemstone

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Credit: Mark A. Schneider/SCIENCE PHOTO LIBRARY

Caption: Carnelian (also spelled cornelian) is a brownish-red mineral which is commonly used as a semi-precious gemstone. Similar to carnelian is sard, which is generally harder and darker. (The difference is not rigidly defined, and the two names are often used interchangeably.) Both carnelian and sard are varieties of the silica mineral chalcedony coloured by impurities of iron oxide. The colour can vary greatly, ranging from pale orange to an intense almost-black coloration. This particular carnelian came from South Africa. Specimen Dimension: approximately 2 cm.

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Keywords: carnelian, chalcedony, cornelian, cut gemstone, gem, gemstone, geology, mineral, mineralogy, orange mineral, polished gemstone, rock, sard, semi-precious stone, semiprecious stone, silica, silicon dioxide, silicon oxide, south africa

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