තලාතු මිනිරං
(තලාතු මිනිරන් වෙතින් යළි-යොමු කරන ලදි)
තලාතු මිනිරං | |
---|---|
General | |
Category | Dark mica series |
රසායනික සූත්රය | K(Mg,Fe)3(AlSi3O10)(F,OH)2 |
Identification | |
අණුක ස්කන්ධය | 433.53 g |
පාට / පැහැය | Dark brown, greenish-brown, blackish-brown, yellow, white |
Crystal habit | Massive to platy |
Crystal system | Monoclinic (2/m) Space Group: C 2/m |
Twinning | Common on the [310], less common on the {001} |
Cleavage | Perfect on the {001} |
Fracture | Micaceous |
Tenacity | Brittle to flexible, elastic |
Mohs scale hardness | 2.5–3.0 |
Luster | Vitreous to pearly |
Streak | White |
Diaphaneity | Transparent to translucent to opaque |
Specific gravity | 2.7–3.1 |
ඝනත්වයy | 2.8–3.4 |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.565–1.625 nβ = 1.605–1.675 nγ = 1.605–1.675 |
Birefringence | δ = 0.03–0.07 |
Pleochroism | Strong |
Dispersion | r < v (Fe rich); r > v weak (Mg rich) |
Ultraviolet fluorescence | None |
References | [1][2][3] |