Home Mica (bright mica, muscovite)
Crystal lattice of muscovite
Fig. 1. Crystal lattice of muscovite (or illite). The double formula K2Al4[(OH)4|Al2Si6O20] is shown. In the tetrahedron layers 1/4 of the Si are replaced by Al. The negatively charged layer packages Al2(OH)2[AlSi3O10] are held together by  K+-Ions.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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