AM_Merwinite Formula: Ca3 Mg Si2 O8 Name: Merwinite Unit cell: 13.254 5.293 9.328 90.0 91.9 90.0 , V=654.03 Space group: P121/A1 (14)

Moore P B , Araki T , American Mineralogist , 57 (1972) p.1355-1374, Atomic arrangement of merwinite, Ca3Mg[SiO4]2, an unusual dense-packed, structure of geophysical interest