This boulangerite is from the Noche Buena Mine in Noche Buena, Mazapil Municipality, Zacatecas, Mexico. This mine contained over 20 different mineral species including several varieties of sulfides that were widely coveted by mineral collectors. It is well known for the many boulangerite specimens found there. This piece consists of a thin crystalline pyrite matrix that is covered with hundreds of needle-like crystals of steel-grey boulangerite crystals. This piece measures 2 x 1 1/8 x 3/4 inches or 51 x 28 x 19 mm.