AM_Biotite_10 Formula: Fe Mg2 K (Al Si3) O12 H2 Name: Biotite Unit cell: 5.345 9.258 10.222 90.0 100.23 90.0 , V=497.78 Space group: C12/M1 (12)

Brigatti M F , Davoli P , American Mineralogist , 75 (1990) p.305-313, Crystal-structure refinement of 1M plutonic biotites, sample M73 from a monzonite in the Valle del Cervo pluton