cornwallite
noun
corn·wall·ite
ˈkȯrnˌwȯˌlīt,
-wəˌl-
plural -s
: a mineral consisting of a basic copper arsenate Cu5(AsO4)2(OH)4.H2O resembling malachite
Word History
Etymology
German cornwallit, from Cornwall, former county in southwest England, its locality + German -it -ite