impsonite

Etymology

From Impson + -ite, after a sample from the Impson Valley (later reclassified as grahamite); coined by George Homans Eldridge in 1901.

impsonite means A black carbonaceous substance, believed to be derived from a fluid bitumen which polymerized after filling a vein. Lexicurio rates it Sui generis — a strength score of 89 out of 100.

noun

A black carbonaceous substance, believed to be derived from a fluid bitumen which polymerized after filling a vein.