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

1840–50; quartz + -ite1

quartzitic [kwawrt-sit-ik] , adjective
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World English Dictionary
quartzite (ˈkwɔːtsaɪt)
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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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 researchers say the ochre was probably rubbed on quartzite slabs to create
  a fine powder.
Their ridges, composed of white quartzite, form cliffs that gleam dazzlingly
  when sighted from a distance.
The new lobby, with quartzite floors that sport fossils, features a bar and a
  breakfast area.
Continued excavation revealed thousands of quartz fragments and a prize
  quartzite projectile point in pristine condition.
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