AM_Pigeonite_44 Formula: Fe1.008 Mg.871 Ca.121 (Si1.98 Al.02) O6 Name: Pigeonite Unit cell: 9.722 8.941 5.247 90.0 108.5 90.0 , V=432.52 Space group: P121/C1 (14)

Alvaro M , Nestola F , Ballaran T B , Camara F , Domeneghetti M C , Tazzoli V , American Mineralogist , 95 (2010) p.300-311, High-pressure phase transition of a natural pigeonite, Locality: Parana, Brazil, Note: P = 0.047 GPa