Actinolite
Actinolite is an amphibole silicate mineral wi the chemical formula Ca2(Mg,Fe)5Si8O22(OH)2.
| Actinolite | |
|---|---|
 Actinolite crystal from Portugal | |
| General | |
| Category | Inosilicates |
| Formula (repeatin unit) | Ca2(Mg,Fe)5Si8O22(OH)2 |
| Strunz clessification | 09.DE.10 |
| Creestal seestem | monoclinic – prismatic, H-M symbol (2/m), space group C2/m |
| Identification | |
| Colour | fauch tae mirk green, yellaeish green an black. White or grey whan in asbestos furm |
| Creestal habit | bladed, fibrous, radial |
| Twinnin | simple or lamellar |
| Cleavage | perfect aloag {110}. |
| Fractur | uneven |
| Mohs scale haurdness | 5–6 |
| Skinkle | vitreous tae dull |
| Streak | white |
| Diaphaneity | leamin tae skyre |
| Speceefic gravity | 3.00 (+0.10, -0.05) |
| Polish skinkle | vitreous |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.613–1.628 nβ = 1.627–1.644 nγ = 1.638–1.655 |
| Birefringence | 0.0250-0.0270 |
| Pleochroism | moderate, yellae tae dark green (in skyre stanes) |
| 2V angle | 78–82° (calc), 84–73° (meas) |
| Ultraviolet fluorescence | inert |
| Absorption spectra | faint line at 503 nm |
| References | [1][2][3][4] |
References
eedit- ↑ Actinolite. Mindat.org
- ↑ Actinolite. Webmineral.org
- ↑ Actinolite. Handbook of mineralogy
- ↑ Gem Reference Guide. City: Gemological Institute of America (GIA), 1988. ISBN 0-87311-019-6