තලාතු මිනිරං

විකිපීඩියා වෙතින්
තලාතු මිනිරං
biotite: Topotype deposit
(Image width: 2.5 mm)
General
CategoryDark mica series
රසායනික සූත්‍රයK(Mg,Fe)3(AlSi3O10)(F,OH)2
Identification
අණුක ස්කන්ධය433.53 g
පාට / පැහැයDark brown, greenish-brown, blackish-brown, yellow, white
Crystal habitMassive to platy
Crystal systemMonoclinic (2/m)
Space Group: C 2/m
TwinningCommon on the [310],
less common on the {001}
CleavagePerfect on the {001}
FractureMicaceous
TenacityBrittle to flexible, elastic
Mohs scale hardness2.5–3.0
LusterVitreous to pearly
StreakWhite
DiaphaneityTransparent to translucent to opaque
Specific gravity2.7–3.1
ඝනත්‍වයy2.8–3.4
Optical propertiesBiaxial (-)
Refractive indexnα = 1.565–1.625
nβ = 1.605–1.675
nγ = 1.605–1.675
Birefringenceδ = 0.03–0.07
PleochroismStrong
Dispersionr < v (Fe rich);
r > v weak (Mg rich)
Ultraviolet fluorescenceNone
References[1][2][3]


  1. Biotite mineral information and data Mindat
  2. Biotite Mineral Data Webmineral
  3. Handbook of Mineralogy
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