AM_Pigeonite_5 Formula: O6 Si2 Mg.93 Fe.829 Mn.027 Ca.193 Name: Pigeonite Unit cell: 9.707 8.943 5.246 90.0 108.47 90.0 , V=431.95 Space group: P121/C1 (14)

Camara F , Carpenter M A , Domeneghetti M C , Tazzoli V , American Mineralogist , 88 (2003) p.1115-1128, Coupling between non-convergent ordering and transition temperature