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Crystal lattice of illite (or muscovite)
Fig. 1. Crystal lattice
of illite  (or muscovite)
Formula KAl2[(OH)2|AlSi3O10]
Density  2.6-2.9 g/cm3
Hardness 1-2
CAS-No. 12173-60-3

Illite is the name for mica-like clay minerals, which - contrary to bentonites - do not show any swelling characteristics. Chemically (chemical data) seen they correspond to muscovite (bright mica), however they show only a grain size up to 2µm. Illite can be formed from kaolin, if potassium is added.

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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