| Mineral | Annite |
|---|---|
| Formula | KFe²⁺3(AlSi₃O₁₀)(OH)₂ |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Cleavage | Perfect on {001} |
| Color | Black, brown, green, blue |
| Density | 3.3 – 3.4 g/cm3 |
| Diaphaneity | Transparent to translucent |
| Hardness | 2.5 - 3.0 |
| Lustre | Vitreous, sub-metallic |
| Type Loc. | Rockport, Essex Co., MA, USA |
| Dana 8 Class | 71.2.2b.3 |
| Strunz Class | 8/H.11-110 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 445 |