(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.

plural of quartz glass

plural of fused quartz

Synonym of fused quartz

plural of quartz lamp

plural of drusy quartz