AM_Erionite-Ca_3 Formula: (Si13.89 Al4.11) Ca1.36 Mg.4 K.87 O53.58 H16.092 Name: Erionite-Ca Unit cell: 13.289 13.289 15.079 90.0 90.0 120.0 , V=2306.15 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 Agate Beach