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moderate vitrain

A field term that, in accordance with an arbitrary scale established for use in describing banded coal, denotes a frequency of occurrence of vitrain bands comprising from 13% to 30% of the total coal layer. Compare: sparse vitrain; abundant vitrain; dominant vitrain.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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