berthierite
noun
ber·thi·er·ite
ˈbər-thē-ə-ˌrīt
plural -s
: a mineral FeSb2S4 consisting of a sulfide of antimony and iron of a dark steel-gray color (specific gravity 4.0)
Word History
Etymology
French berthierite, after Pierre Berthier †1861 French chemist + French -ite