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[kwawrt-sahyt] /ˈkwɔrt saɪt/

a granular metamorphic rock consisting essentially of in interlocking grains.
a very hard metamorphic rock consisting of a mosaic of intergrown quartz crystals
a white or grey sandstone composed of quartz

1837, from quartz + -ite.
A metamorphic rock consisting entirely of quartz. Quartzite forms when sandstone or chert are heated during metamorphism.


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