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  Physical Properties of Mica

Characteristic

Unit

Muscovite

Phlogopite
Colour
 
Ruby / Green
Amber / Yellow
Density
gm/cm3
2.6 - 3.2
2.6 - 3.2
Specific Heat
  
0.21
0.21
Hardness
Moh Scale
2.8 - 3.2
2.3 - 3.0
Optic Axial Angle
  
55 - 75
5 - 25
Tensile Strength
kgf/cm2
about 1750
about 1000
Shear Strength
kgf/cm2
2200 - 2700
1000 - 1300
Compression Strength
kgf/cm2
1900 - 2850
---
Modulus of Elasticity
kgf/cm2 x 10-3
1400 - 2100
1400 - 2100
Coefficient of expansion per °C perpendicular to cleavage plane
  
9 X 10-6 - 36 X 10-6
30 X 10-6 - 60 X 10-6
Calcining Temperature
C
700 - 800
900 - 1000
Maximum operating temperature
C
500 - 600
800 - 900
Perpendicular to cleavage planes
Gm.cal/sec/cm2/C/cm
about 0.0013
about 0.0001
Parallel to cleavage planes
Gm.cal/sec/cm2/C/cm
  
about 0.012
Water of constitution %
  
4.5
3.0
Moisture absorption
  
Very low
Very low
Apparent electric strength
0.001" to 0.003" KV/mm
120 - 200
---
R.M.S. at 15° C (60°F)
0.01" to 0.05" KV/mm
40 - 80
30 -60
Permittivity at 15°C(60oF)
  
6 - 7
5 - 6
Power Factor (loss tangent)
@ 15° C (60° F)
0.0001 - 0.0004
0.001 - 0.005
Volume Resistivity
25° C (77° F) ohm cm
40 x 1013-2 x 1017
1 x 1012 - 1 x 1012
Acid reaction
  
Affected by Hydrofluoric Acid
Affected by Sulphuric Acid