polydymite
noun
po·lyd·y·mite
pəˈlidəˌmīt
plural -s
: a mineral Ni4S5 consisting of a nickel sulfide that is isomorphous with linnaeite, siegenite, carrollite, and violarite
Word History
Etymology
German polydymit, from poly- + dym- (from Greek didymos twin) + -it -ite