AM_Combeite_1 Formula: (Na2 Ca2) Si3 O9 Name: Combeite Unit cell: 10.464 10.464 13.168 90.0 90.0 120.0 , V=1248.66 Space group: P3121 (152)

Ohsato H , Takeuchi Y , Maki I , Acta Crystallographica, Section C , 42 (1986) p.934-937, Structure of Na4Ca4[Si6O18], Locality: synthetic low-temperature form