Citation: Gualtieri, A.; Artioli, G.; Passaglia, E.; Bigi, S.; Viani, A.; Hanson, J. C. (1998). Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample from Shourdo. American Mineralogist, 83, pp. 590-606.
Formula: Al3.954 Ca1.22 H72.096 K Mg0.26 O49.2 Si14.046