According to the quartz content, it can be divided into two categories: 1 feldspar quartzite, the quartz content is more than 75%, often containing minerals such as feldspar and mica, and the feldspar content is generally less than 20%. If the feldspar content increases, the transition to shallow granules. 2 Quartzite, quartz content greater than 90%, may contain a small amount of mica, feldspar, magnetite and other minerals.

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