Topic summary
Endellionite
Extracted from the Wikipedia article Bournonite.
It was first mentioned by Philip Rashleigh in 1797 as an ore of antimony and was more completely described in 1804 by French crystallographer and mineralogistJacques Louis, Comte de Bournon (1751–1825), after whom it was named. The name given by Bournon himself (in 1813) was endellione, since used in the form endellionite, after St Endellion, the locality in Cornwall where the mineral was first found.