AM_Silvialite Formula: (Na1.548 Ca2.452) (Al4.872 Si7.128) (S.522 C.478) O27.524 Name: Silvialite Unit cell: 12.16 12.16 7.56 90.0 90.0 90.0 , V=1117.86 Space group: I14/M1 (1)

Teertstra D K , Schindler M , Sherriff B L , Hawthorne F C , Mineralogical Magazine , 63 (1999) p.321-329, Silvialite, a new sulfate-dominant member of the scapolite group with, an Al-Si composition near the I4/m-P42/n phase transition, Locality: McBride Province, Australia