Formula: CuCo₂S₄

Species: Sulfides

Colour: Bright silver color

Lustre: Metallic

Hardness: 4½ – 5½

Specific Gravity: 4.5 – 4.8

Crystal System: Isometric

Member of: Carrollite Subgroup > Thiospinel Group > Spinel Supergroup

Name: Named in 1852 by William Leonard Faber after the type locality in Carroll County, Maryland – USA.

Type Locality: Patapsco Mine (Finksburg Mine; Orchard Mine), Patapsco Mines, Finksburg, Carroll Co., Maryland – USA

Isostructural with: Linnaeite