Having analysized the degree of crystallization of andalusite, it is believed that the anthracite is a low-grade thermal metamorphic rock.
从红柱石的结晶程度分析，这种无烟煤是一种低级热接触变质岩。
Having analysized the degree of crystallization of andalusite, it is believed that the anthracite is a low-grade thermal metamorphic rock.
从红柱石的结晶程度分析，这种无烟煤是一种低级热接触变质岩。
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