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Mica, KAl2

Polytypism in layered silicates has been well characterized. There are as many as 19 polytypes known among micas. The repeat unit in muscovite mica, [KAl2(OH)2(Si3Al)0 o], for instance, consists of a sheet of octahedrally coordinated aluminium ions sandwiched between two identical sheets of (Si, AOO tetrahedra, the large ions being located in interlayer positions. Surface oxygens of the tetrahedra in... [Pg.53]

When three out of four oxygens are shared, i.e., for an O/Si ratio of 2.5, a sheet structure results (Table 3.4). Clays, talcs Mg3(0H)2(Si205)2, and micas KAl2(OH)2(AlSi30io) are typical of that structure. Kaolinite clay... [Pg.71]

PhyllosHicates Layer silicates (micas and clays) 2 5 ratio of Sl 0 Kaolinite (china clay) Al2(Si205)(0H)4 Muscovite (mica) KAl2(AISi30.,o)(OH)2 75% sharing ... [Pg.7]

Muscovite (white mica) KAl2(OH)j (AlSi30i ) (Figure M63) Type A + silicate on both sides. A substituted pyrophyllite ) A colorless to yellowish mineral. Can easily be split to thin, transparent sheets... [Pg.910]

Mica capacitors consist of mica, KAl2(Si3Al)0,o(OH)2, plates with fired-on silver electrodes. The metallized plates are stacked together in a multilayer fashion. Mica capacitors are extremely stable over time, have low thermal coefficient of capacitance, and have relatively low loss. [Pg.167]

Muscovite or white mica has the formula KAl2(OH)2(AlSi3Oio). Since they are not... [Pg.564]

Mica for use as a dielectric is obtained from the mineral muscovite (KAl2(Si3Al)O10(OH)2) which can be cleaved into single-crystal plates between 0.25 and 50 fim thick. [Pg.260]

Muscovite (KAl2(SisAl)Oio(OH)2) Muscovite mica is considerably more stable than biotite. Biotite contains oxidizable Fe(II) and some Mn(II), whereas muscovite does not. In addition, the dioctahedral (Al) layer of muscovite seems to fit much better between the two layers of silica-alumina tetrahedra, and hence is more stable, than the trioctahedml (Mg and Fe(ll)) layer of biotite. [Pg.191]

Dioctahedral micas. IR spectra of synthetic micas of the muscovite, KAl2(Si3AIOio)(OH)2,-aluminoceladonite, KMgAl(Si40io)(OH)2, series were presented by Velde (1978). Representative spectra in this series are shown in Figure 4. Assignments... [Pg.356]

Single silicate plus double hydroxide [Si,A10,o] 3 1 KAl2(OH)2Si3A10io, muscovite, (micas) KMg3(OH)2Si3A10io, phlogopite, (micas)... [Pg.161]

See other pages where Mica, KAl2 is mentioned: [Pg.329]    [Pg.253]    [Pg.329]    [Pg.744]    [Pg.197]    [Pg.24]    [Pg.102]    [Pg.744]    [Pg.146]    [Pg.57]    [Pg.607]    [Pg.329]    [Pg.253]    [Pg.329]    [Pg.744]    [Pg.197]    [Pg.24]    [Pg.102]    [Pg.744]    [Pg.146]    [Pg.57]    [Pg.607]    [Pg.262]    [Pg.353]    [Pg.269]    [Pg.329]    [Pg.112]    [Pg.119]    [Pg.40]    [Pg.53]    [Pg.57]    [Pg.69]    [Pg.457]    [Pg.541]    [Pg.18]    [Pg.1771]    [Pg.8]    [Pg.899]    [Pg.213]    [Pg.966]    [Pg.462]    [Pg.353]    [Pg.966]    [Pg.132]    [Pg.447]    [Pg.1770]    [Pg.143]    [Pg.1]    [Pg.166]    [Pg.114]    [Pg.280]   
See also in sourсe #XX -- [ Pg.2 , Pg.253 ]



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