Leo fan dai (leonardite) is a coal that has been boiling chandin oxidized naturally. Look, there is not a soft, light brown to black. Normally found in the coal source at a depth no more contains acid, humic acid, organic soil contamination and other coal, this is due to the decayed ruins of a decaying animal carcasses by chemical and biological processes. Soil contamination of coal will have different properties depending on the origin, and there are also those, meaning Leo fan dai is lignite that was issued along with the naturally contains silica, salt, calcium, Humic acid and iron of different organic acids. Leo fan dai look like charcoal, lignite They are often found leading to coal seam area.
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