(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

Quartz artificially coated with metal to give it an iridescent multicolored sheen.

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

(mineralology) A type of quartz, often found in the hollow cavity of agate geodes, consisting of a layer of minute quartz crystals that have crystallized on the surface.

A portable electric radiant heater consisting of elements sealed in quartz glass tubes which produce infrared radiation in front of a reflective backing.

(electronics) A small crystal of quartz accurately cut in certain directions so that it can be vibrated at a particular frequency, to produce an electric signal of constant known frequency.

A mercury vapor lamp consisting of an ultraviolet light source, and enclosed by an envelope made from quartz rather than glass, which transmits ultraviolet light with little absorption.

(chemical engineering) A type of glass consisting of almost pure silica in amorphous (noncrystalline) form.