AM_Gehlenite_2 Formula: Ca2 Mg.21 Al1.54 Si1.24 O7 Name: Gehlenite Unit cell: 7.7115 7.7115 5.0498 90.0 90.0 90.0 , V=300.30 Space group: P-421M (113)

Swainson I P , Dove M T , Schmahl W W , Putnis A , Physics and Chemistry of Minerals , 19 (1992) p.185-195, Neutron powder diffraction study of the akermanite-gehlenite, solid solution series, Sample: 25% Ak