white mica


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white mica

[′wīt ′mī·kə]
(mineralogy)
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Chemical analyses also documented the presence of white mica. The presence of white mica (muscovite) and Li-mica (protolithionite) was acknowledged by microscopy of selected samples and by chemical analyses.
The early alteration stage in the Echassieres stock is represented by quartz, white mica, pyrophyllite, donbassite, tosudite and kaolinite, and the late stage is formed by quartz, fluorite, illite and smectite.
Illite and white mica display very low amounts of phengite component.
3.04 3.80 2.79 F 5.56 6.42 5.14 Cl 0.00 0.00 0.00 O=(F,Cl) 2.34 2.70 2.16 Total 99.31 100.18 100.21 apfu [Si.sup.4+] 6.53 6.79 6.38 [Al.sup.IV] 1.47 1.21 1.62 [Al.sup.VI] 2.51 2.48 2.51 [Ti.sup.4+] 0.05 0.03 0.04 [Fe.sup.2+] 1.88 1.64 2.03 [Mn.sup.2+] 0.08 0.08 0.10 [Mg.sup.2+] 0.03 0.04 0.03 [Ca.sup.2+] 0.00 0.00 0.00 [Na.sup.1+] 0.08 0.06 0.06 [K.sup.1+] 1.87 1.85 1.89 [Li.sup.1+] 0.91 1.12 0.83 [F.sup.1-] 5.23 5.92 4.82 [Cl.sup.1-] 0.00 0.00 0.00 O 24 24 24 Fe/(Fe + Mg) 0.98 0.98 0.99 Table 4 Representative analyses of white mica and illite from topaz- albite granite and argillized granite of the Hub stock.
White micas, which are relatively rare in slightly greisenized topaz-albite granites, are depleted in Fe and Mg compared to the ideal Tschermak's substitution line (Si = f(Fe+Mg)) (Fig.
The occurrence of chlorite associated to white mica is shown in Figure 6a.
Stilpnomelane and biotite: K-bearing phases other than white mica and K-feldspar were only observed in FO0016.
(2001) augmented Bermans data by data for components of chlorite (amesite = [Mg.sub.4][Al.sub.2][Al.sub.2][Si.sub.2][O.sub.10]][(OH).sub.8], daphnite = [Fe.sub.5]Al[Al[Si.sub.3][O.sub.10]][(OH).sub.8]) and potassic white mica (pyrophyllite = [Al.sub.2][[Si.sub.4][O.sub.10]][(OH).sub.2], Mg-Al-celadonite = KAlMg[[Si.sub.4][O.sub.10]][(OH).sub.2], Fe-Al-celadonite = KAlFe[[Si.sub.4][O.sub.10]][(OH).sub.2]) and corresponding activity models for both phases.
(2001) showed a strong scatter when those with pyrophyllite component in potassic white mica and amesite component in chlorite (see equilibria 1 and 2) were considered.