Crystal system. α-quartz: trigonal trapezohedral class 3 2; β-quartz: hexagonal 622[1] In nature quartz crystals are often twinned, distorted, or so intergrown with

Quartz crystals are manufactured for frequencies from a few tens of kilohertz to tens of megahertz. More than two billion (2×109) crystals are manufactured annually.

quartz n. A very hard mineral composed of silica, SiO 2 , found worldwide in many different types of rocks, including sandstone and granite

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quartz clock ( ′kwörts ¦kläk ) ( horology ) A clock using the piezoelectric property of a quartz crystal, in which the crystal is introduced