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carnelian (kärnēlˈyən) [key] or cornelian kôr–, kər–, variety of red chalcedony, used as a gem. It is distinguished from sard by the shade of red, carnelian being bright red and sard brownish. The red coloring is apparently caused by iron oxide.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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