One of the best localities for Boulangerite is the Noche Buena Mine, Mazapil, Zacatecas, Mexico. This locality has produced excellent examples of fibers in dense habit associated within a matrix with other
ore minerals. The Yaogangxian Mine, Yizhang Co., Hunan Province, China, produces dark Boulangerite crystals of very large size, associated with
Quartz, as well as
included within the Quartz.
Eastern Europe has several classic localities for Boulangerite, where it occurs in the typical, hair-like habit. These include Příbram, Bohemia, Czech Republic; the Trepča complex, Kosovo; and the Herja Mine, Baia Mare, Maramureș Co., Romania (where the Boulangerite is often densely including
Calcite crystals. Western European localities of note are the Ramsbeck District, North Rhine-Westphalia, Germany; La Mure, Isère, Rhône-Alpes, France; and the Bottino Mine, Stazzema, Tuscany, Italy.
Boulangerite is uncommon in the U.S. The two most important deposits are the Coeur d'Alene district, Shoshone Co., Idaho; and the Cleveland Mine, Stevens County, Washington. Canada has produced Boulangerite, especially in odd tubular form, at the Rogers Mine, Madoc, Hastings Co., Ontario.
