ChristianAnswers.Net WebBible Encyclopedia
The name of this stone is derived from Chalcedon, where it is said to have been first discovered.
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 LXX, and “carbunculus” in the Vulgate.