AM_Pigeonite_6 Formula: O6 Si2 Mg.921 Fe.85 Mn.027 Ca.179 Name: Pigeonite Unit cell: 9.711 8.944 5.249 90.0 108.49 90.0 , V=432.37 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