Chalcedony

Chalcedony is a form of quartz. It can have many colors, but it is often gray or milky white. Agate is a type of chalcedony. Agate often has visible bands, layers, or cloudy patterns in different colors.

Chalcedony was the third foundation stone of the New Jerusalem in John’s vision (Revelation 21:19).

See also Minerals and Metals; Precious Stones.