VARIETY INFORMATION:
Carnelian (sometimes spelled "cornelian") is an orange variety of chalcedony, whose color can vary from nearly yellow to nearly red. If the color is darker (appearing brownish), it would be called Sard. The color of both is due to iron oxide impurities. Carnelian is always somewhat translucent; sard may appear opaque. Carnelian is the traditional birthstone for July, and the Zodiac birthstone for Virgo. It is associated with luck and safety. Carnelian is only one of several chalcedony (cryptocrystalline quartz) varieties. The primary varieties are as follows:
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