patronite
/pəˈtrəʊnʌɪt/ /ˈpatrənʌɪt/Mineralogy
noun
A black, lustrous, fine-grained mixture of vanadium sulphides that occurs in Peru and is exploited as a source of vanadium; (in later use) specifically the monoclinic sulphide VS4.
Origin
Early 20th century. From the name of A. Rizo-Patron, Peruvian metallurgist + -ite.