Actinolite
Appearance
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] |
Actinolite is an amphibole silicate mineral wi the chemical formula Ca2(Mg,Fe)5Si8O22(OH)2.
References
[eedit | eedit soorce]- ↑ 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