AM_Pigeonite_10 Formula: Mg1.85 Ca.15 Si2 O6 Name: Pigeonite Unit cell: 9.523 8.7 5.136 90.0 107.8 90.0 , V=405.15 Space group: P121/C1 (14)

Nestola F , Tribaudino M , Ballaran T B , American Mineralogist , 89 (2004) p.189-196, High pressure behavior, transformation and crystal structure of synthetic iron-free pigeonite, Sample: P = 4.5 GPa