Impsonite is a black, carbonaceous substance, with a specific gravity of 1.10–1.25 and a carbon content of 50–85%. It is described as an asphaltic pyrobitumen. It is believed to be derived from a fluid bitumen which polymerized after filling a vein. The term was coined by George Homans Eldridge in 1901, referring to the asphaltic material in t...
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http://en.wikipedia.org/wiki/Impsonite
a black variety of asphaltite with a jagged fracture.
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https://www.infoplease.com/dictionary/impsonite
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