Thousands of rock definition
Thousands of rocks are low-grade metamorphic rocks with thousands of structures. The original rock is usually composed of argillaceous rock, siltstone and medium-acid tuff, which is formed by the regional low-temperature dynamic metamorphism or the regional dynamic heat flow metamorphism. The surface of the microscopically deformed wafer has a silky luster. The degree of metamorphism is between the slate and the schist.
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