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CHALCEDONY kal’ sĕd ə nĭ, a semi-precious stone (Rev 21:19), with many different colored varieties, which occurs as a cavity filling in lavas and as nodules in sedimentary rocks. Varieties include chrysoprase, agate and onyx (q.v.). All are very fine-grained silica with a waxy luster.

See also

  • Minerals
  • [[Precious Stones