AM_Akermanite_3 Formula: Ca2 Mg.46 Al.99 Si1.52 O7 Name: Akermanite Unit cell: 7.7475 7.7475 5.0359 90.0 90.0 90.0 , V=302.27 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: 50% Ak