| Formula | Ca2(Mg; Fe 2+)5Si8O22(OH)2 |
| Origin | Zagi Berg (Pakistan) |
| Description | dark green blades of actinolite |
| Classification (Lapis) | Amphiboles |
| Crystal System | monoclinic |
| Hardness | 5,0 – 6,0 |
| Colour | Bright green to grayish green; in thin section, colorless, pale green to deep green. |
| Streak | white |
| Luminescence | sometimes in short wave UV |
| Luster | vitreous |
| Transparency (Opacity) | transparent to translucent |
| Cleavage | good |
| Fracture | uneven to conchoidal |
| Magnetism | negative |
| Geological Setting | Produced by low-grade regional or contact metamorphism of magnesium carbonate, mafic, or ultramafic rocks; also in glaucophane-bearing blueschists |
| Specific Gravity | 3,07 g/cm3 |
