Carrollite

Formula:  Cu(Co,Ni)2S4

Origin of name:  Locality; Carroll Co., Maryland, U.S.A.

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:  on {111}, sometimes lamellar

Unit cell: a = 9.48 Ǻ   

 

Colour:  Light gray to steel-gray, rapidly tarnishes to copper-red

Diaphaneity: Opaque

Luster:  Metallic

Habit:  Crystals octahedral; massive, compact, granular

Hardness:  4.5 to 5.5

Specific gravity:  4.5 to 4.8

Cleavage:  1; {001} imperfect

Tenacity:  Subconchoidal to uneven fracture

Streak:

 

Synonyms/varieties:

 

Comments: Found in hydrothermal vein deposits

 

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