AM_Illite_6 Formula: K Al2 Si4 O12 H2 Name: Illite Unit cell: 5.1973 8.999 10.147 90.0 99.0 90.0 , V=468.74 Space group: C121 (5)

Drits V A , Zviagina B B , McCarty D K , Salyn A L , American Mineralogist , 95 (2010) p.348-361, Factors responsible for crystal-chemical variations in the solid solutions, from illite to aluminoceladonite and from glauconite to celadonite