quartzite
1
Coin
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Quartzite is a metamorphic rock mainly composed of quartz (with a quartz content greater than 85%), formed by metamorphic processes of quartz sandstone and siliceous rocks. It is generally formed by regional metamorphism and recrystallization of quartz sandstone or other siliceous rocks. It is also possible that siliceous rocks near magma undergo thermal contact metamorphism to form quartzite. Common colors include green, gray, yellow, brown, orange red, white, blue, purple, red, etc.
