AM_Pigeonite_48 Formula: Fe1.008 Mg.871 Ca.121 (Si1.98 Al.02) O6 Name: Pigeonite Unit cell: 9.622 8.861 5.181 90.0 107.92 90.0 , V=420.31 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 = 3.172 GPa