Quartz: Mineral information, data and localities.
A brown to brownish-red translucent variety of chalcedony. Pliny the Elder stated that it was named after Sardis, in Lydia, where it was first discovered; but the name probably came with the stone from Persia (Persian sered = yellowish-red). Sardonyx: A variety of Agate with reddish-brown and either black or white bands. Sceptre Quartz