Quartzite - MSN Encarta

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Quartzite
Quartzites are formed through the metamorphism of quartz-rich sandstones. They are formed mostly of the mineral quartz. Quartzite may sometimes look like marble, but can be ...
Quartzite - Wikipedia, the free encyclopedia
Quartzite (from German Quarzit [1]), not to be confused with the mineral quartz, is a hard, metamorphic rock which was originally sandstone. [2] Sandstone is converted into ...
Quartzite
Allan Harris Slate ... A metamorphic rock distinguished by its sparkling appearance when placed under light.

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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.