AM_Clinoptilolite-Ca_4 Formula: Na.26 Ca.74 K1.22 Si18 O50.12 H11.526 Name: Clinoptilolite-Ca Unit cell: 17.6589 17.9241 7.4034 90.0 116.243 90.0 , V=2101.79 Space group: C12/M1 (12)

Cappelletti P , Langella A , Cruciani G , European Journal of Mineralogy , 11 (1999) p.1051-1060, Crystal-chemistry and synchrotron Rietveld refinement, of two different clinoptilolites from volcanoclastites, of North-Western Sardinia, Sample: ZC16, Locality: volcanoclastites of North-Western Sardinia