AM_Pigeonite_49 Formula: Fe1.008 Mg.871 Ca.121 (Si2 Al2) O6 Name: Pigeonite Unit cell: 9.518 8.804 5.056 90.0 104.04 90.0 , V=411.02 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 = 3.587 GPa