Mineralpedia Details for Carrollite
Named after the type locality at the Patapsco mine near Sykesville in Carroll County, Maryland, USA. Carrollite is an uncommon mineral that can be found in additional USA localities, Mexico, Chile, Bulgaria, Slovakia, Germany, Sweden, Namibia, the Democratic Republic of the Congo, Zambia, Zimbabwe, Japan, North Korea, and Australia, among several others. Carrollite occurs in hydrothermal vein deposits with associated minerals which include tetrahedrite, linnaeite, siegenite, polydymite, chalcopyrite, bornite, digenite, djurleite, chalcocite, pyrrhotite, pyrite, sphalerite, millerite, gersdorfite, ullmannite, and cobaltoan calcite.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/carrollite.pdf
Carrollite from Kamoya South mine, Katanga, Congo
Brilliant silver, metallic modified cubes of Carrollite crystals to 1.5cm.
Carrollite from Kambove, Central area, Shaba, Congo
Silvery euhedral crystal to 8mm with mirror-like luster aside "melted" Chalcopyrite crystals on Calcite matrix.