berzelianite
noun
ber·ze·lian·ite
(ˌ)bər-ˈzēl-yə-ˌnīt,
-lē-ə-
plural -s
: a mineral Cu2Se consisting of copper selenide having a silver-white color when freshly broken (specific gravity 6.7)
Word History
Etymology
Swedish berzelianit, irregular from Baron J. J. Berzelius †1848 Swedish chemist + Swedish -it -ite