| Linnaeite | |
| Category: | Sulfide mineral Thiospinel group Spinel structural group |
| Formula: | Co+2Co+32S4 |
| Imasymbol: | Lin[1] |
| Strunz: | 2.DA.05 |
| System: | Cubic |
| Class: | Hexoctahedral (mm) H-M symbol: (4/m 2/m) |
| Symmetry: | Fdm |
| Unit Cell: | a = 9.43 Å; Z = 8 |
| Color: | Steel gray to gray violet |
| Habit: | As octahedral crystals; massive, granular |
| Twinning: | On |
| Cleavage: | Imperfect on |
| Fracture: | Subconchoidal |
| Mohs: | 4.5–5.5 |
| Luster: | Metallic |
| Streak: | Grayish-black |
| Diaphaneity: | Opaque |
| Gravity: | 4.8–5.8 |
| Alteration: | Tarnishes in air |
| References: | [2] [3] [4] |
Linnaeite is a cobalt sulfide mineral with the composition Co+2Co+32S4. It was discovered in 1845 in Västmanland, Sweden, and was named to honor Carl Linnaeus (1707–1778).[2]
Linnaeite forms a series with polydymite, Ni+2Ni+32S4.[5] Linnaeite is found in hydrothermal veins with other cobalt and nickel sulfides in many localities around the world.[4]