mineral parting

n
discrete layer of mineral or mineral-rich sediment interbedded within lower mineral matter content coal.
DISCUSSION — The term is generally reserved for layers that are visually distinct by virtue of their mineral content. Besides their obvious contribution to the mineral content (and ash yield) of mined coal, mineral partings frequently serve as planes of weakness upon which the coal breaks. D388

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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