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Carrollite

Type Locality
Patapsco mine (Finksburg Mine; Orchard Mine), Patapsco Mines, Finksburg, Sykesville, Carroll Co., Maryland, USA
Mineral Data
Cu(Co,Ni)2S4
Strunz: 
2.DA.05
Physical Properties
Crystal System: 
Isometric
Hardness: 
4.5 - 5.5
Tenacity: 
very brittle
Synonyms
Synonyms: 
Sychnodymite
Photos