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Chemical & Physical Properties of Phlogopite Mica


Chemical Properties
Chemical Formaula : KMg3(Si3Al)O10(OH,F)2
Composition : Molecular Weight = 419.25 gm

Element Element %Symbol Compound % Compound
Potassium 09.33 %K 11.23 % K2O
Magnesium17.39 %Mg 28.84 % Mg2O
Aluminium06.44 %Al 12.16 % Al2O3
Silicon20.10 %Si 42.99 % SiO2
Hydrogen00.24 %H 02.15 % H2O
Oxygen41.98 %O--
Fluorine4.53 %F 4.53 % F
--F -1.91 % -O=F2

Empirical Formaula : KMg3AlSi3O10F(OH)
Environment : Contact and regional metamorphic limestones and dolomites. Ultramafic igneous rocks
IMA Status : Valid Species (Pre-IMA) 1841
Physical Properties
Cleavage : {001} Perfect
Color : Brown, Gray, Green, Yellow, Reddish brown.
Density : 2.7 - 2.9, Average = 2.8
Diaphaneity : Transparent to translucent
Fracture : Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Hardness : 2-2.5 - Gypsum-Finger Nail
Luminescence : Fluorescent, Short UV=Straw to Lemon Yellow, Long UV=Weak Blue-white to blue-gray.
Luster : Vitreous - Pearly
Streak : White
Electron Density : Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Phlogopite =2.83 gm/cc.
Photoelectric : PEPhlogopite = 2.30 barns/electron
U=PEPhlogopite x relectron= 6.46 barns/cc
Specific Heat : 0.21
Optical Axial Angle : 5 - 25
Tensile Strength : about 1000 kgf/cm2
Shear Strength : 1000 - 1300 kgf/cm2
Compression Strength : ---
Modulus of Elasticity : 1400 - 2100 x 10-3 kgf/cm2
Calcining Temperature : 900 - 1000 oC
Maximum Operating Temperature : 800 - 900 oC
Percentage of Water Consitution : 3.0
Moisture Absorption : Very Low
Apparent Electric Strength : --
Permitivity at 15 oC (60 F) : 5 - 6
Power Factor (loss tangent) at 15 oC (60 F) : 0.001 - 0.005
Volume Resistivity ( @ 25 oC, 77 oF ohm cm) : 1 x 1012
Acid Reaction : Affected by Sulphuric 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