Muscovite properties

Muscovite mica formed as a primary mineral in pegmatites and granodiorite differs in physical properties compared to muscovite mica formed by secondary alteration (mica schist) (Table 2). The main differences are in flexibiUty and abiUty to be delaminated. Primary muscovite is not as brittle and delaminates much easier than muscovite formed as a secondary mineral. Mineralogical properties of the principal natural micas are shown in Table 3. The make-up of muscovite, phlogopite, and biotite are as follows ... 

Property Muscovite Phlogopite Biotite Synthetic fluorophlogopite... 

Mica [12001 -26-2]—Cl Pigment White 20, Cl No. 77019. A white powder obtained from the naturally occurring mineral muscovite mica, consisting predominantly of a potassium aluminum siHcate, [1327-44-2] H2KAl2(Si0 2- Mica may be identified and semiquantitatively determined by its characteristic x-ray diffraction pattern and by its optical properties. 

Chatteijee N. D. and Johannes W. (1974). Thermal stability and standard thermodynamic properties of synthetic 2M, muscovite KAl[AlSi30io(OU)2]. Contrib. Mineral Petrol, 48 89-114. 

Eugster H. R, Albee A. L., Bence A. E., Thompson J. B. Jr., and Walbaum D. R. (1972). The two phase region and excess mixing properties of paragonite-muscovite crystalline solutions. J. Petrol, 13 147-179. 

RICH (C. I.) and OBERSHAIN (S.S.), 1955. Chemical and clay mineral properties of a red-yellow podzolic soil derived from a muscovite schist. Soil Sci. Ame. Proc. jL9, 334-9. 

The tendency of mica to cleave easily along the (100) crystallographic plane results in smooth,clean reproducible surfaces. This property, coupled with good thermal stability, has led to its wide use as a substrate in surface chemical studies (2). Indeed, the ability of Muscovite mica to be cleaved to give atomically smooth surfaces over areas of several square centimeters... 

Oxidation kinetics, 292-293 Reduction kinetics, 288 Removal from solution, 443-445 pe-pH diagram, 256,441 Manganese carbonate, 59,433 Manganese oxides, 131 Methane, 257-258, 324 Mica, 102-108 Layer charge, 113 Structure, 115 Molecular Weight, 13,14 Mole fraction, 202 Equivalent fraction, 202 Montmorillonite., 102,104, 109, 123 C-axis spacings, 171 Layer charge, 120 Structure, 171 Composition, 104 Physical properties, 123-124 Chemical properties, 123-124 Muscovite, 104, 123 Structure, 108 Composition, 104... 

Kaolin has a use in plastisol formulations giving good rheological control. Calcium carbonate is also used in this area. An alternative to calcium carbonate, phyllite, has been evaluated. This material, which contains quartz, muscovite and kaolinite, was characterised on the basis of paste viscosity, gelation and fusion behaviour, and mechanical properties (70). 

FIGURE 22.4 Naturally occurring muscovite mica. The mechanical properties of crystals of mica are quite anisotropic. Thin sheets can be peeled off a crystal of mica by hand, but the sheets resist stresses in other directions more strongly. Transparent, thin sheets of mica, sometimes called isinglass, have been used for heat-resistant windows in stoves or in place of window glass. 

I), Although the structures of talc and muscovite are rather similar, the latter is much harder and unsuitable as a lubricant. Why Should these minerals have any properties in common ... 

PHYSICAL PROPERTIES (M) - muscovite mica, (P) - phlogopite mica most data in this table courtesy of Polar Minerals, Mt. Vernon, IN, USA ... 

Lyons, J.S., Furlong, D.N., and Healy, T.W.. The electrical double-layer properties of the mica (muscovite)-aqueous electrolyte interface, Aust. J. Chem., 34, 1177, 1981. 

Traditional components for this system would be K2O, AI2O3, Si02, and H2O, so c = 4. If the solutes are very dilute and we have only one phase (water), Phase Rule (3.33) says / = c — 1 = 3, so we have to specify the concentrations of K, Al and Si to define the system. But if we have three solid phases in equilibrium with the water, such as kaolinite, muscovite, and quartz, then / = c — p = 0, and the system is invariant (we don t have to specify anything). However, even though all properties of the system are fixed, including the species in the liquid phase, we are unable to describe or calculate the ionic species using these components. 

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