boulangerite
noun
bou·lan·ger·ite
büˈlanjəˌrīt
plural -s
: a bluish gray metallic-looking mineral Pb5Sb4S11 consisting of antimony lead sulfide occurring usually in plumose masses (hardness 2.5–3, specific gravity 5.75–6.0)
Word History
Etymology
German boulangerit, from C.L. Boulanger †1849 French mining engineer + German -it -ite