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ATHENA

MINERALOGY

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Mineral: ILLITE
Formula: K0,65Al2▢Al0,65Si3,35O10(OH)2
Crystal System: Monoclinic
Group: Mica group. Interlayer-deficient mica. Dioctahedral
References: AM 50 (1965), 411; CM 36 (1998), 905
Type Locality: Maquoketa Shale, Gilead, Calhoun Co., Illinois, USA
Comments: A variety of Muscovite

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