AM_Andremeyerite
Formula: Ba Fe1.92 Mg.08 Si2 O7
Name: Andremeyerite
Unit cell: 7.488 13.785 7.085 90.0 118.23 90.0 , V=644.34
Space group: P121/C1 (14)

Cannillo E , Mazzi F , Rossi G , American Mineralogist , 73 (1988) p.608-612, Crystal structure of andremeyerite, BaFe(Fe,Mn,Mg)Si2O7