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boulangerite

boulangerite Min.
  (buːˈlɑːndʒəraɪt, -æ-)
  [f. Boulanger name of a French mineralogist + -ite.]
  A native sulphide of antimony and lead.

1868 Dana Min. §122 Embrithite is from the locality of boulangerite at Nertschinsk.

Oxford English Dictionary

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