quartz

[kwawrts]
noun
one of the commonest minerals, silicon dioxide, SiO 2 , having many varieties that differ in color, luster, etc., and occurring either in masses (as agate, bloodstone, chalcedony, jasper, etc.) or in crystals (as rock crystal, amethyst, citrine, etc.): the chief constituent of sand and sandstone, and an important constituent of many other rocks. It is piezoelectric and used to control the frequencies of radio transmitters.

Origin:
1750–60; < German Quarz

quartzose [kwawrt-sohs] , quartzous [kwawrt-suhs] , adjective

quarts, quartz.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quartz (kwɔːts)
 
n
1.  a colourless mineral often tinted by impurities, found in igneous, sedimentary, and metamorphic rocks. It is used in the manufacture of glass, abrasives, and cement, and also as a gemstone; the violet-purple variety is amethyst, the brown variety is cairngorm, the yellow variety is citrine, and the pink variety is rose quartz. Composition: silicon dioxide. Formula: SiO2. Crystal structure: hexagonal
2.  short for quartz glass
 
[C18: from German Quarz, of Slavic origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

quartz
1756, from Ger. Quarz "rock crystal," from M.H.G. twarc, probably from a W.Slavic source (cf. Czech tvrdy, Polish twardy "quartz"), from O.C.S. tvrudu "hard."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

quartz (kwôrts)
n.
A very hard crystalline form of silicon dioxide used in chemical apparatus and in optical and electric instruments.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
quartz   (kwôrts)  Pronunciation Key 
A hard, transparent trigonal mineral that, after feldspar, is the most common mineral on the surface of the Earth. It occurs as a component of igneous, metamorphic, and sedimentary rocks as well as in a variety of other forms such as rock crystal, flint, and agate. Some crystalline forms, such as amethyst, are considered gemstones. Chemical formula: SiO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Two wizards go and remove the stone, which appears to be quartz, and then the
  novice is resuscitated.
Coesite is a variant of quartz that forms only under intense heat and pressure.
Step on a hunk of quartz in the dirt, and you'll think nothing of it.
It appears to be made of quartz and has cutouts near the widest end.
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