| Formula | Na[NaCa](Mg; Fe 2+)5Si8O22(OH)2 |
| Origin | Koksha Valley (Afghanistan) |
| Description | idiomorphic, elongated, transparent richterite crystal |
| Classification (Lapis) | Amphiboles |
| Crystal System | monoclinic |
| Hardness | 5,0 – 6,0 |
| Colour | Brown, yellow, green, brownish red; colorless to pale yellow in thin section |
| Streak | white or grayish |
| Luminescence | yes |
| Luster | vitreous |
| Transparency (Opacity) | transparent to translucent |
| Cleavage | perfect |
| Fracture | uneven |
| Magnetism | negative |
| Geological Setting | Commonly in contact metamorphosed limestones; in alkalic igneous rocks and carbonatites. |
| Specific Gravity | 3,1 g/cm3 |
