9 Grammatical Pitfalls


[kwawrts] /kwɔrts/
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 of quartz
1750-60; < German Quarz
Related forms
[kwawrt-sohs] /ˈkwɔrt soʊs/ (Show IPA),
[kwawrt-suh s] /ˈkwɔrt səs/ (Show IPA),
Can be confused
quarts, quartz. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for quartz
  • 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.
  • Some are crystal clear, others of smoky or colored quartz.
  • The researchers also discovered quartz flakes packed in some of the cave's crevices.
  • The oxygen stolen from the metals turns the silicon into silicon dioxide, or quartz.
  • The art itself-carved with chunks of quartz-is said to depict visions that came to the shamans in their trances.
  • Radios normally use a quartz crystal or some other oscillator to serve as a reference when adjusting the radio frequency.
  • Halogen bulbs are more efficient because their quartz cases allow the tungsten filaments to burn at a higher temperature.
British Dictionary definitions for quartz


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
short for quartz glass
Word Origin
C18: from German Quarz, of Slavic origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quartz

"silicon dioxide," 1756, from German Quarz, Zwarc "rock crystal," from Middle High German twarc, probably from a West Slavic source, cf. Czech tvrdy, Polish twardy "quartz," noun uses of an adjective meaning "hard," from Old Church Slavonic tvrudu "hard," from Proto-Slavic *tvrd-, from PIE *(s)twer- "to grasp, hold; hard."

Online Etymology Dictionary, © 2010 Douglas Harper
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quartz in Medicine

quartz (kwôrts)
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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quartz in Science
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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