Source : Webster's Revised Unabridged Dictionary (1913)

Boulangerite \Bou*lan"ger*ite\, n. [From Boulanger, a French
   mineralogist.] (Min.)
   A mineral of a bluish gray color and metallic luster, usually
   in plumose masses, also compact. It is a sulphide of antimony
   and lead.