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matter. these mineral constituents may have been present in the original plants, may have deposited as the peat beds formed, or crystallized from waters percolating through the coal bed. the principal ones are quartz, kaolinite, calcite, and pyrite. traces of many mineral elements are present. some
react chemically with the coal. it has been found that helium most satisfactorily meets these requirements. an approximation for the density can be derived by measuring the displacement of water by the coal, usually in granular form. however, it is questionable whether the water molecules can penetrate...
https://niir.org/books/book/handbook-on-coal-lignin-wood-rosin-processing/isbn-9789381039748/zb,,18ba5,a,0,0,a/index.html