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Mineralpedia Details for Carrollite

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Carrollite

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

Formula
Cu1+Co2S4 
Crystal System
Isometric 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
gray, gray, copper red, light gray, steel 
Class
Isometric - Hexoctahedral 
Fracture
Conchoidal 
Hardness
4.5-5.5 
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Carrollite from Kamoya South Mine, Katanga, Congo

Carrollite
            from Kamoya South Mine, Katanga, Congo

Brilliant silver, metallic modified cubes of Carrollite crystals to 1.5cm.

Click thumbnail images for larger view.

Carrollite from Kambove, Central area, Shaba, Congo

Carrollite
            from Kambove, Central area, Shaba, Congo

Silvery euhedral crystal to 8mm with mirror-like luster aside "melted" Chalcopyrite crystals on Calcite matrix.

Click thumbnail images for larger view.

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