AM_Melilite_3 Formula: Zn (Ge1.255 Si.745) Ca2 O7 Name: Melilite Unit cell: 9.112 7.9 9.38 90.0 114.03 90.0 , V=616.70 Space group: P121/N1 (14)

Armbruster T , Rothlisberger F , Seifert F , American Mineralogist , 75 (1990) p.847-858, Layer topology, stacking variation and site distortion in melilite-related, compounds in the system CaO-ZnO-GeO2-SiO2, low-temperature polymorph, Ca2ZnGe1.25Si.75O7