Physical Properties of Natural MICA
| Characteristics | Unit | Phligophite | Muscovite |
|---|---|---|---|
| Chemical Composition (Less water of hydration) |
H2KMg3,Al(SiO4)3 | H2KAl3(SiO4)3 | |
| Color | Amber/Yellow | Ruby/Green | |
| Density | (Gm/cm3) | 2.6-3.2 | 2.6-3.2 |
| (Lb/In3) | 0.095-0.116 | 0.095-0.116 | |
| Specific Heat | 0.21 | 0.21 | |
| Hardness | Moh Scale | 2.3-3.0 | 2.8-3.2 |
| Shore Test | 70-100 | 80-105 | |
| Optic axial angle | 7-25 | 55-175 | |
| Tensile Strength | Kgf/cm2 | About 1000 | About 1750 |
| Lbf/In2 | About 15000 | About 25000 | |
| Shear Strength | Kgf/cm2 | 1000-1300 | 2200-2700 |
| Lbf/In2 | 14000-19000 | 31000-38000 | |
| Compression Strength | Kgf/cm2 | — | 1900-2850 |
| Lbf/In2 | — | 27000-32000 | |
| Modulus of Elasticity | Kgf/cm2 x 10-3 | 1400-2100 | 1400-2100 |
| Lbf/In2 x 10-6 | 20-30 | 20-30 | |
| Coefficient of expansion per0C perpendicular to cleavage plane |
9 x 10 -6 -36 x 10-6 | 9 x 10 -6 -60 x 10-6 | |
| Clacining Temperature | C | 900-1000 | 800-900 |
| F | 1650-1830 | 1470-1650 | |
| Maximum operating temprature | C | 800-900 | 600-800 |
| F | 1470-1650 | 1110-1470 | |
| Thermal Conductivity | Gm.cal/Sec/cm2/C/cm | About 0.0001 | About 0.0013 |
| Perpendicular to cleavage planes | BTU/hr/ft2/Of/ft | About 0.24 | About 0.31 |
| Parallel to cleavage planes | Gm.cal/Sec/cm2/C/cm | About 0.012 | — |
| BTU/hr/ft2/Of/ft | About 3.0 | — | |
| Water of constitution % | 3.0 | 4.5 | |
| Moisture absorption | Very low | Very low | |
| Apparent electric strength | 0.001" to 0.003" KV/mm | — | 120-200 |
| Thick Volts per 0.001" | — | 3000-5000 | |
| R.M.S at 15øC (60øF) | 0.001" to 0.003" KV/mm | 30-60 | 40-80 |
| Thick Volts per 0.001" | 750-1500 | 1000-2000 | |
| Permittivity as 15øC (60øF) | 5-6 | 6-7 | |
| Power Factor (loss tangent) | @ 15øC (60øF) | 0.001-0.005 | 0.0001-0.0004 |
| Volume Resistivity | 25øC(77øF) ohm cme | 1 x 1012 – 1 x 1012 | 40 x 1013 – 2 x 1017 |
| Acid reaction | Affected by Sulphuric acid | Affected by Hydrofluoric acid |