- a microcrystalline, translucent variety of quartz, often milky or grayish.
Origin of chalcedony
Examples from the Web for chalcedony
When you desire his appearance, touch that chalcedony just before you.Imaginary Conversations and Poems
Walter Savage Landor
Point for a drill or perforator chipped from chalcedony (Fig. 47).The Archaeology of the Yakima Valley
Harlan Ingersoll Smith
Carnelian is a red variety of chalcedony, sard a brown variety.
A minute mosaic of chalcedony was used to portray white and iris and cornea.The Message
Stone rings were in common use, formed chiefly of chalcedony.Finger-Ring Lore
- a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO 2
Word Origin and History for chalcedony
c.1300, from Latin calcedonius, in Vulgate translating Greek khalkedon in Rev. xxi:19, found nowhere else. Connection with Chalcedon in Asia Minor "is very doubtful" [OED]. The city name is from Phoenician and means "new town."
- A type of quartz that has a waxy luster and varies from transparent to translucent. It is usually white, pale-blue, gray, brown, or black and is often found as a lining in cavities. Agate, flint, and onyx are forms of chalcedony. Chemical formula: SiO2.