(Geology) The most common rock-forming mineral. It is made up of silicon dioxide (SiO2). Quartz crystals may be glassy or opaque (milky quartz) and exist in a variety of colors including white, rose, smoky gray, and purple.
QUARTZ
Meaning of QUARTZ in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012