AM_Illite_5 Formula: K Al2 Si4 O12 H2 Name: Illite Unit cell: 5.2042 8.9852 10.205 90.0 101.49 90.0 , V=467.63 Space group: C12/M1 (12)

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, Locality: Füzerradvany, Hungary, Sample Name: Zempleni