POLYDYMITE

pəˈlidəˌmīt noun

( -s )

Etymology: German polydymit, from poly- + dym- (from Greek didymos twin) + -it -ite — more at -dymus

: a mineral Ni 4 S 5 consisting of a nickel sulfide that is isomorphous with linnaeite, siegenite, carrollite, and violarite