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quartz n.

from Quarz "quartz": a common mineral, silicon dioxide [probably diminutive of Middle German querch "dwarf", so-called because dwarves were supposedly responsible for relatively worthless minerals. English quartz and dwarf and German Quarz and Zwerg "dwarf" probably all come from a common root.] See also cobalt and nickel.

• "Yet for a million years early humans went to the considerable trouble of collecting and carrrying large hunks of quartz and obsidian miles across a baking landscape to make them into axes at this one ten-acre site." Bill Bryson, Bill Bryson's African Diary, 2002, p. 25.
• "'No, the exterior lights are a hundred-fifty-watt quartz halogen,' Edmunds was saying." Michael Crichton, Sphere, 1987, p. 58.
• "And primitive quartz tools found at a lower level of the dig proved older still, dating back to about a million years ago." Rick Gore, "The First Europeans", National Geographic, Jul. 1997, p. 104.
• "Quartz forms veins and nodules in sedimentary rock, principally limestone." "Quartz" Microsoft® Encarta® 96 Encyclopedia, 1996.
• Mechanical and Quartz Watch Repair, by Mick Watters, 1999.
• City of Quartz: Excavating the Future in Los Angeles, by Mike Davis, 1992.
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quartzite n.

a granular metamorphic rock consisting essentially of quartz in interlocking grains.

• "There are the granites, quartzite schists, gneisses, and other igneous and metamorphic rocks which were formed in pre-Cambrian times." Fred Singleton, A Short History of Finland, 1989, p. 5.
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