Why the colour of a coal is black ??
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Why is coal black? Coal is fossilized lignin-rich plant tissues on the way to graphite, so it is worth observing what makes graphite black. Graphite absorbs across the entire visible and near infrared ranges, having a nearly wavelength-independent transmission of 1-πα per layer, where α=1/137 is the fine structure constant.
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Fresh coal is a jet-black rock that is noticably less dense than most other rocks. In the field, however, weathering often gives the coal a greyish, yellowish, or rust-colored coloring.
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