Actinolite
Actinolite crystal from Portugal
General
Category	Inosilicates
Formula (repeatin unit)	Ca 2 (Mg,Fe) 5 Si 8 O 22 (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	n α = 1.613?1.628 n β = 1.627?1.644 n γ = 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 Ca ₂ ( Mg , Fe ) ₅ Si ₈ O ₂₂ (O H ) ₂ .

References [ eedit | eedit soorce ]