Found in granite and sandstone, it consists of silicon dioxide.
One form of this mineral exhibits chatoyancy and features golden-brown fibers. A cryptoclinic mixture of this mineral and moganite has a waxy luster and is called chalcedony. This piezoelectric mineral is found at the bottom of Bowen's reaction series. Gold ore is sometimes found in veins of this mineral, which is used in crystal oscillators. Found in granite and sandstone, it consists of silicon dioxide. Other variants of this mineral include jasper, citrine, and amethyst. For 10 points, name this silicate mineral with a hardness of 7 on the Mohs scale.
One form of this mineral exhibits chatoyancy and features golden-brown fibers.
quartz <SH>