Phlogopite biotite

Property Muscovite Phlogopite Biotite Synthetic fluorophlogopite... 

Mica group is a large one, with more than 30 minerals (muscovite, phlogopite, biotite are the most common among them). They are often found in limestones, dolomites, and other magnesium-rich rocks. 

Mica 2 1 high unhydrated cation tri- trioctahedral phlogopite, biotite... 

Figure 3-17 Bond strength, S, versus tetrahedral rotation, a, of micas, (a) curved phlogo-pite, (b) calculated structures, (c) lepidolites, (d) fluorophlogopites, (e) phlogopite-biotite series, (0 dioctahedral micas.

Keywords aluminosilicate, aspect ratio, muscovite, phlogopite, biotite, polypropylene, rigidity, heat distortion, warpage, impact strength, hardness, particle size, hammer mill, surface treatment. 

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 ... 

Silicates with layer. structures include some of the most familiar and important minerals known to man, partieularly the clay minerals [such as kaolinite (china clay), montmorillonite (bentonite, fuller s earth), and vermiculite], the micas (e.g. muscovite, phlogopite, and biotite), and others such as chrysotile (white asbestos). 

Table 5.55 Chemical analyses of natural micas (from Deer et al., 1983). Note that ionic fractions are retrieved on a 24-anion basis—i.e. double the canonical formula. (1) Muscovite from a low-grade metamorphic prasinite schist (2) glauconite from a sandstone (3) phlogopite from a marble (4) biotite from a quartz-bearing latite (5) lepidolite from a pegmatite. ...

Figure 5.51 fo2 stability field of biotite. (A) Pseudobinary phlogopite-annite mixture. Numbers at experimental points indicate observed Fe/(Fe + Mg) atom ratio. (B) Annite. HM = hematite-magnetite buffer NNO = Ni-NiO buffer MW = magnetite-wuestite buffer QFM = quartz-fayalite-magnetite buffer. From Wones and Eugster (1965). Reprinted with permission of The Mineralogical Society of America. 

Figure A4-1 Comparison of oxygen diffusivity in various minerals under hydrothermal conditions- Mineral names (from high to low diffusivity) An, anorthite Ah, albite Bt, biotite Ms, muscovite Phi, phlogopite Cc, calcite Qz, quartz Ap, apatite Mt, magnetite Hb, hornblende Tr, tremolitel Tt, titanite Di, diopside Rut, rutile Aim, almandine.

All of the saponites that have been discussed were grown from solution or were found by the alteration of non-micaceous minerals or glasses. Similar type clays can form by the weathering of biotite and phlogopite. MacEwan (1954) has described such a clay (cardenite) from Scottish soils. The formula he gives is ... 

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