Actinolite

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Actinolite
Actinolite Portugal.jpg
Actinolite crystal from Portugal
General
CategoryInosilicates
Formula
(repeatin unit)
Ca2(Mg,Fe)5Si8O22(OH)2
Strunz clessification09.DE.10
Creestal seestemmonoclinic – prismatic, H-M symbol (2/m), space group C2/m
Identification
Colourfauch tae mirk green, yellaeish green an black. White or grey whan in asbestos furm
Creestal habitbladed, fibrous, radial
Twinninsimple or lamellar
Cleavageperfect aloag {110}.
Fracturuneven
Mohs scale haurdness5–6
Skinklevitreous tae dull
Streakwhite
Diaphaneityleamin tae skyre
Speceefic gravity3.00 (+0.10, -0.05)
Polish skinklevitreous
Optical propertiesBiaxial (-)
Refractive indexnα = 1.613–1.628
nβ = 1.627–1.644
nγ = 1.638–1.655
Birefringence0.0250-0.0270
Pleochroismmoderate, yellae tae dark green (in skyre stanes)
2V angle78–82° (calc), 84–73° (meas)
Ultraviolet fluorescenceinert
Absorption spectrafaint 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]

  1. Actinolite. Mindat.org
  2. Actinolite. Webmineral.org
  3. Actinolite. Handbook of mineralogy
  4. Gem Reference Guide. City: Gemological Institute of America (GIA), 1988. ISBN 0-87311-019-6