Chalcedony

About Chalcedony

A microcrystalline form of quartz made of fine intergrown fibers, with a waxy luster. The name probably comes from the ancient Greek town of Chalcedon. Agate, onyx, carnelian, chrysoprase, and bloodstone are all varieties of chalcedony. Used alone, the name usually means the soft blue or gray translucent material. It is porous enough to be dyed easily. It has been carved into seals and cameos since antiquity.