AM_Pigeonite_50 Formula: Fe1.008 Mg.871 Ca.121 (Si1.98 Al.02) O6 Name: Pigeonite Unit cell: 9.494 8.818 5.06 90.0 104.11 90.0 , V=410.83 Space group: C12/C1 (15)

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 = 3.649 GPa