impsonite
English edit
Etymology edit
Impson + -ite, after a sample from the Impson Valley (later reclassified as grahamite); coined by George Homans Eldridge in 1901.
Noun edit
impsonite (countable and uncountable, plural impsonites)
- A black carbonaceous substance, believed to be derived from a fluid bitumen which polymerized after filling a vein.