AM_Pigeonite_52 Formula: Fe1.008 Mg.871 Ca.121 (Si1.98 Al.02) O6 Name: Pigeonite Unit cell: 9.402 8.716 4.996 90.0 103.28 90.0 , V=398.46 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 = 7.762 GPa