MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY
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. 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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