AM_Erionite-Ca_2 Formula: (Si13.746 Al4.254) Ca1.8 K.85 O51.36 H49.746 Name: Erionite-Ca Unit cell: 13.304 13.304 15.078 90.0 90.0 120.0 , V=2311.21 Space group: P63/MMC (194)

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 from Tunguska