berthierite

noun
ber·thi·er·ite | \ ˈbər-thē-ə-ˌrīt \
plural -s

Definition of berthierite 

: a mineral FeSb2S4 consisting of a sulfide of antimony and iron of a dark steel-gray color (specific gravity 4.0)

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History and Etymology for berthierite

French berthierite, after Pierre Berthier †1861 French chemist + French -ite

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