siegenite
noun
sie·gen·ite
ˈsēgəˌnīt,
ˈzē-
plural -s
: a mineral (Co,Ni)3S4 consisting of sulfide of nickel and cobalt isomorphous with linnaeite, violarite, carrollite, and polydymite
Word History
Etymology
Siegen, city in western Germany, its locality + English -ite