boulangerite

noun
bou·​lan·​ger·​ite | \büˈlanjəˌrīt\
plural -s

Definition of boulangerite 

: 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)

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History and Etymology for boulangerite

German boulangerit, from C.L. Boulanger †1849 French mining engineer + German -it -ite

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