colorless glass made of almost pure silica

a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities

a stamp mill for stamping quartz

a thin plate or small rod of quartz cut along certain lines and ground so that it can produce an electric signal at a constant frequency; used in crystal oscillators

colorless glass made of almost pure silica

a mercury-vapor lamp that is enclosed in a quartz container instead of a glass container

a stamp mill for stamping quartz

an oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal

hard metamorphic rock consisting essentially of interlocking quartz crystals

relating to or made of quartz