AM_Offretite_2
Formula: (Si12.6 Al5.4) Ca1.5 K.89 Mg.86 O52.07 H4.166
Name: Offretite
Unit cell: 13.308 13.308 7.597 90.0 90.0 120.0 , V=1165.19
Space group: P-6M2 (187)

Gualtieri A , Artioli G , Passaglia E , Bigi S , Viani A , Hanson J C , American Mineralogist , 83 (1998) p.590-606, Crystal structure-crystal chemistry relationships in the zeolites erionite, and offretite, Sample #2 from Fitta