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franckeite

noun
franck·​e·​ite | \ˈfräŋkəˌīt\
plural -s

Definition of franckeite 

: a mineral consisting of a dark gray or black massive lead antimony tin sulfide (specific gravity 5.55)

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First Known Use of franckeite

1893, in the meaning defined above

History and Etymology for franckeite

German franckeït, from Carl and Ernest Francke, 19th century German mining engineers + German -it -ite

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The first known use of franckeite was in 1893

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