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Chemical & Physical Properties of Muscovite Mica


Chemical Properties
Chemical Formaula : KAl2(Si3Al)O10(OH,F)2
Composition : Molecular Weight = 398.71 gm

Element Element %Symbol Compound % Compound
Potassium 09.81 %K 11.81 % K2O
Aluminum20.30 %Al 38.36 % Al2O3
Silicon21.13 %Si 45.21 % SiO2
Hydrogen00.46 %H 04.07 % H2O
Oxygen47.35 %O--
Fluorine00.95 %F 00.95 % F
--F -0.40 % -O=F2

Empirical Formaula : KAl3Si3O10(OH)1.8F0.2
Environment : Granites and pegmatites
IMA Status : Valid Species (Pre-IMA) 1850
Physical Properties
Cleavage : {001} Perfect
Color : White, Gray, Silver white, Brownish white, Greenish white
Density : 2.77 - 2.88, Average = 2.82
Diaphaneity : Transparent to translucent
Fracture : Brittle - Sectile - Brittle fracture with slightly sectile shavings possible
Hardness : 2-2.5 - Gypsum-Finger Nail
Luminescence : Non-fluorescent
Luster : Vitreous (Glassy)
Streak : White
Electron Density : Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Muscovite =2.83 gm/cc.
Photoelectric : PEMuscovite = 2.39 barns/electron
U=PEMuscovite x relectron= 6.72 barns/cc
Specific Heat : 0.21
Optical Axial Angle : 55 - 75
Tensile Strength : about 1750 kgf/cm2
Shear Strength : 2200-2700 kgf/cm2
Compression Strength : 1900 - 2850 kgf / cm2
Modulus of Elasticity : 1400 - 2100 x 10-3 kgf/cm2
Calcining Temperature : 700 - 800 oC
Maximum Operating Temperature : 500 - 600 oC
Percentage of Water Consitution : 4.5
Moisture Absorption : Very Low
Apparent Electric Strength : 120 - 200 for (0.01" to 0.05" KV/mm)
Permitivity at 15 oC (60 F) : 6 - 7
Power Factor (loss tangent) at 15 oC (60 F) : 0.0001 - 0.0004
Volume Resistivity ( @ 25 oC, 77 oF ohm cm) : 40 x 1013 - 2 x 1017
Acid Reaction : Affected by Hydrofluoric Acid

Address : Prime Natural Resources, Bishrambagh Road, P.O. : Jhumri Telaiya, Dist : Koderma, State : Jharkhand, India - 825409 Phone No. : 00-91-9931508894. Email id : mica@pnrmica.in