Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:ILLITE
Formula:K0.65Al2[]Al0.65Si3.35O10(OH)2
Crystal System:Monoclinic
Strunz Nr:8/H.13-30
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:Dioctahedral interlayer deficient-micas. [] = vacancy

Mineral:ILLITE = a series name
Formula:(K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O] (?)
Crystal System:Monoclinic
References:AM 50 (1965), 411; CM 36 (1998), 905

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