Abstract
AN examination of a microscope section of Indian coal from the Raniganj coal-field showed that the main substance of the coal was a madder-red coloured, translucent material, which in a section cut vertical to the bedding planes of the coal, gave faint pleochroic effects when examined in plane polarised light. The same substance, when viewed between crossed Nicols, had distinct extinction parallel to the lines of the laminas and behaved like a uniaxial mineral. The peculiarity is that the whole of the red-madder substance, seen in the field of the microscope, behaved as though in optical continuity and as if part of a single crystal.
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FOX, C. The Crystalline Nature of the Chief Constituent of Ordinary Coal. Nature 118, 913 (1926). https://doi.org/10.1038/118913a0
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DOI: https://doi.org/10.1038/118913a0
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