AM_Scapolite_1 Formula: (Na2.5 Ca1.5) Si8 Al4 C.5 Cl.5 O25.5 Name: Scapolite Unit cell: 12.082 12.082 7.576 90.0 90.0 90.0 , V=1105.90 Space group: P142/N1 (1)

Levien L , Papike J J , American Mineralogist , 61 (1976) p.864-877, Scapolite crystal chemistry: Aluminum-silicon distributions, carbonate group, disorder, and thermal expansion, after heating