quartz·ite

[kwawrt-sahyt]
noun
a granular metamorphic rock consisting essentially of quartz in interlocking grains.

Origin:
1840–50; quartz + -ite1

quartz·it·ic [kwawrt-sit-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
quartzite (ˈkwɔːtsaɪt) [Click for IPA pronunciation guide]
 
n
1.  a very hard metamorphic rock consisting of a mosaic of intergrown quartz crystals
2.  a white or grey sandstone composed of quartz

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Quartzite is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a scrap or morsel of food left at a meal.
American Heritage
Science Dictionary
quartzite   (kwôrt'sīt')  Pronunciation Key 
A metamorphic rock consisting entirely of quartz. Quartzite forms when sandstone or chert are heated during metamorphism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The cladding of irregular quartzite blocks has been cut so accurately that no
  mortar was needed to hold them together.
The new lobby, with quartzite floors that sport fossils, features a bar and a
  breakfast area.
As its name suggests, quartzite is primarily composed of quartz.
The cladding of irregular quartzite blocks was cut so accurately that no mortar
  was needed to hold them together.
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