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  Boulangerite is a mineral, lead antimony sulfide, formula Pb5Sb4S11. It was named in 1837 honor of French mining engineer Charles Boulanger. It forms metallic grey monoclinic crystals. Sometimes the crystals form a fine feathery mass which has been called plumosite.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Boulangerite". A list of authors is available in Wikipedia.
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