The coal has lower metamorphic grade with high ash.
煤的变质程度低，灰分高。
A new thought is proposed to forecast mineralization of endogenetic deposits based on metamorphic grade of coal.
据此提出了根据煤变质程度进行内生矿床成矿预测的新思路。
Besides metamorphic grade, the nature of original rocks and the precursor of carbonaceous material may also influence graphitization.
除了变质程度以外，原岩的类型和碳的原始物质的种类也会影响碳的石墨化作用。
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