Mineralpedia Details for Freibergite
Named after the type locality at the Reiche Zeche mine in Freiberg, Germany. Found in hydrothermal deposits and widespread worldwide, Freibergite can be found in, additionally, the Czech republic, Russia, Sweden, Norway, Scotland, Canada, Bolivia, Japan, Australia, and several other localities. Feibergite occurs with a wide variety of sulfosalts and sulfides.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/freibergite.pdf
Freibergite from Obecnice, Pribram, Czech Republic
Euhedral well-formed tetrahedrons, the largest to 8mm across with several smaller amongst discoidal Siderite crystals.
Freibergite from Zaca mine, Alpine Co., California, United States
Excellent well-formed crystal to about 0.75mm with numerous faces.