AM_Serandite Formula: (Mn1.82 Ca.18) Na Si3 O9 Name: Serandite Unit cell: 7.683 6.889 6.747 90.53 94.12 102.75 , V=347.29 Space group: P-1 (2)

Takeuchi Y , Kudoh Y , Yamanaka T , American Mineralogist , 61 (1976) p.229-237, Crystal chemistry of the serandite-pectolite series and related minerals