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QUARTZITE
Quartzite
is a metamorphic rock formed when quartz sands are subjected to extreme heat and
pressure due to tectonic forces. Pure quartzite is white. The individual quartz
crystals are generally visible. Like a marble, color and patterns in quartzite
are the result of impurities. Quartzite is very hard (unlike a marble), and is
not water soluble. Being thus resistant to weathering, it often forms ridges and
hilltops.
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