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Quartzite
QUARTZITE:
Quartzite, common and widely distributed rock composed mainly or
entirely of quartz The compact , granular rock is a form of
metamorphosed sandstone in which silica , or quartz has been deposited
between the grains of quartz of which the sandstone is essentially
composed. Other minerals that may be present in small amounts in
quartzite include feldspar, mica rutile, tourmaline, and zircon.
Quartzite has a smooth fracture and is found primarily among ancient
rocks, such as those of the Cambrian or Precambrian system.