chalcostibite
noun
chal·co·stib·ite
ˌkalkōˈstiˌbīt
plural -s
: a lead-gray mineral CuSbS2 consisting of antimony copper sulfide (specific gravity 4.75–3.0)
Word History
Etymology
German chalkostibit, from chalk- chalc- + stib- + -it -ite