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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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Mindat
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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.

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Carrollite from Kambove dist., Katanga, Democratic Republic of Congo

Carrollite
            from Kambove dist., Katanga, Democratic Republic of Congo

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

A small group of grey tarnished Carrollite crystals with dodecahedral forms.

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Carrollite from Shinkolobwe, Katanga, Democratic Republic of Congo

Carrollite
            from Shinkolobwe, Katanga, Democratic Republic of Congo

Excellent silvery cubic crystals to 1cm.

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Carrollite from Shaba Cu belt, Democratic Republic of Congo

Carrollite
            from Shaba Cu belt, Democratic Republic of Congo

A 2cm crystal showing 6 faces in matrix with other sulfides and Calcite.

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Carrollite from Rokana mine, Kitwe, Copperbelt Province, Zambia

Carrollite
            from Rokana mine, Kitwe, Copperbelt Province, Zambia

A large partial Carrollite crystal with sides to 2.5cm.

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