| Mineral | Actinolite |
|---|---|
| Formula | Ca2(Mg,Fe2+)5(Si8O22)(OH)2 |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Cleavage | Distinct/Good on {110} |
| Color | Green, Green-black, Green-grey, Black |
| Density | 3.0 – 3.2 g/cm3 |
| Diaphaneity | Transparent, Translucent |
| Fracture | Splintery |
| Hardness | 5.0 - 6.0 |
| Lustre | Vitreous, Silky |
| Streak | White |
| Dana 8 Class | 66.01.03a.02 |
| Strunz Class | 8/F.10-20 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 303 |