quartzitic

quartzite

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

Origin:
1840–50; quartz + -ite1

quartzitic [kwawrt-sit-ik] , adjective
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Collins
World English Dictionary
quartzite (ˈkwɔːtsaɪt)
 
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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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
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