AM_Natrolite_2
Formula: Si3 Al2 Na2 O12 H4
Name: Natrolite
Unit cell: 18.43 18.71 6.52 90.0 90.0 90.0 , V=2248.26
Space group: FDD2 (43)

Peacor D R , American Mineralogist , 58 (1973) p.676-680, High temperature, single-crystal X-Ray study of natrolite, T = 146 C