English edit

 
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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)

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

Anagrams edit