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.