Chalcedony

1 verse

Revelation

And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;

From Easton's Bible Dictionary

Matthew George Easton, 1897

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 colour. Pliny so names the Indian ruby. The mineral intended in Revelation is probably the Hebrew nophekh, translated “emerald” (Ex. 28:18; 39:11; Ezek. 27:16; 28:13). It is rendered “anthrax” in the LXX., and “carbunculus” in the Vulgate. (See CARBUNCLE.)

From Smith's Bible Dictionary

William Smith, 1884

only in (Revelation 21:19) The name is applied in modern mineralogy to one of the varieties of agate. It is generally translucent and exhibits a great variety of colors. So named because it was found near the ancient Chalcedon, near Constantinople.