(mineralogy) The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO₂. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.

The extraction of quartz from the earth, and moreover the subsequent extraction of gold from quartz. / The penetration of another rock or of earth by quartz.

plural of quartz

the mining of gold-bearing quartz

(geology) A metamorphosed schist composed mostly of quartz with some mica and/or tourmaline.

(mineralogy) Any form of diorite containing appreciable amounts of quartz.

Any timepiece that makes use of the piezoelectric property of a quartz crystal.

A brown to black variety of quartz.

A pinkish to reddish-colored type of quartz. / A light rosy pink color like that of the gem.

plural of quartz clock