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Carnelian is a translucent chalcedony or an A-grade Agate that receives its beautiful red tints from iron oxides. Most deep red Carnelian is heat treated to darken the material evenly; this one has been tumbled to give a matte finish. The ancient Greeks and Romans particularly valued Carnelian and believed that it could calm bad temper or still the blood. Mined in Brazil, India, Australia, Russia, Madagascar, South Africa, Uruguay and U.S.A. AKA- Cornelian, Mecca Stone, Natural Agate. Mohs hardness 6.5