Carrollite
| Synonyms: | Carrolite, Corrolite, Sychnodymite |
| Classification: | Sulfides |
| Chemical formula: | Cu(Co,Ni)2S4 |
| Crystal system: | Isometric |
| Density (g/cm3): | 4,5 - 4,8 measured, 4,83 calculated |
| Tenacity: | Very brittle |
| Cleavage: | None Observed |
| Fracture: | Irregular/Uneven, Conchoidal, Sub-Conchoidal |
| Hardness (Mohs): | 4,5 - 5,5 |
| Colour: | Bright silver color, rarely tarnishes to copper red or violet gray |
| Lustre: | Metallic |
| Streak: | Gray black |
| Type locality: | Patapsco mine (Finksburg Mine; Orchard Mine), Patapsco Mines, Finksburg, Sykesville, Carroll Co., Maryland, USA |
| Application: | Cobalt ore |