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mentioned only in Rev. 21:19, as one of the precious stones in the foundation of the New Jerusalem

The name of this stone is derived from Chalcedon, where it is said to have been first discovered.

In modern mineralogy this is the name of an agate-like quartz of a bluish color. Pliny so names the Indian ruby.

The mineral intended in Revelation is probably the Hebrew nophekh, translated “emerald” (Exodus 28:18; 39:11; Ezek. 27:16; 28:13). It is rendered “anthrax” in the Septuagint, and “carbunculus” in the Vulgate.