Category:Illite - Wikimedia Commons
Illite, a clay-like series, is essentially a K-deficient muscovite. (mindat.org) Interlayer-deficient micas with composition: K 0.65 Al 2.0 Al 0.65 Si 3.35 O 10 (OH) 2 (Fleischer's Glossary of Minerals, 2014) Mindat - …
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