- Impsonite
Impsonite is a black,
carbonaceous substance, with aspecific gravity of 1.10–1.25 and a carbon content of 50–85%. It is described as an asphalticpyrobitumen .It is believed to be derived from a fluidbitumen which polymerized after filling a vein. [ [http://www.answers.com/topic/impsonite Impsonite: Definition and Much More from Answers.com ] ]External links
*http://www.mindat.org/min-11115.html
References
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