fusain
Sign in to savethumb|An example of fusain, charcoal that has been fossilized, found at a spoil pile from an underground coal mine in Grundy County, Illinois, US
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thumb|An example of fusain, charcoal that has been fossilized, found at a spoil pile from an underground coal mine in Grundy County, Illinois, US
Fusain is a fossilised carbon deposit which, after some controversy, has been identified as fossilised charcoal.