data_global _chemical_name_mineral 'Clinoptilolite-Ca' loop_ _publ_author_name 'Cappelletti P' 'Langella A' 'Cruciani G' _journal_name_full 'European Journal of Mineralogy' _journal_volume 11 _journal_year 1999 _journal_page_first 1051 _journal_page_last 1060 _publ_section_title ; Crystal-chemistry and synchrotron Rietveld refinement of two different clinoptilolites from volcanoclastites of North-Western Sardinia Sample: ZC16 ; _database_code_amcsd 0006813 _chemical_compound_source 'volcanoclastites of North-Western Sardinia' _chemical_formula_sum 'Na.26 Ca.74 K1.22 Si18 O50.12 H28.24' _cell_length_a 17.6589 _cell_length_b 17.9241 _cell_length_c 7.4034 _cell_angle_alpha 90 _cell_angle_beta 116.243 _cell_angle_gamma 90 _cell_volume 2101.790 _exptl_crystal_density_diffrn 2.243 _symmetry_space_group_name_H-M 'C 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,z' '1/2+x,1/2-y,z' '-x,y,-z' '1/2-x,1/2+y,-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Na1 0.15700 0.00000 0.59000 0.13000 0.04000 Ca2 0.04300 0.50000 0.17900 0.37000 0.10000 K3 0.23400 0.50000 0.03800 0.61000 0.07000 Si1 0.17950 0.17130 0.09900 1.00000 0.01000 Si2 0.21030 0.41190 0.50350 1.00000 0.02000 Si3 0.20740 0.18920 0.70670 1.00000 0.02000 Si4 0.06820 0.29930 0.41880 1.00000 0.01000 Si5 0.00000 0.21700 0.00000 1.00000 0.01000 O1 0.18720 0.50000 0.47260 1.00000 0.02000 O2 0.23670 0.12400 0.60810 1.00000 0.03000 O3 0.19170 0.15300 0.89160 1.00000 0.03000 O4 0.23490 0.10590 0.25350 1.00000 0.03000 O5 0.00000 0.32820 0.50000 1.00000 0.04000 O6 0.07990 0.15950 0.05690 1.00000 0.01000 O7 0.12750 0.23470 0.55410 1.00000 0.03000 O8 0.01680 0.27710 0.18180 1.00000 0.01000 O9 0.21390 0.25320 0.19270 1.00000 0.02000 O10 0.11690 0.37640 0.42140 1.00000 0.03000 Wat1 0.33500 0.00000 0.09200 0.38000 0.09000 Wat2 0.11800 0.00000 0.86400 0.44000 0.06000 Wat3 0.08200 0.40800 0.96400 1.05000 0.14000 Wat4 0.50000 0.00000 0.50000 1.00000 0.03000 Wat5 0.02700 0.10800 0.39600 0.51000 0.04000 Wat6 0.12500 0.00000 0.35700 0.37000 0.05000 Wat7 0.07200 0.00000 0.68300 0.69000 0.22000 Wat8 0.05500 0.00000 0.15400 0.93000 0.17000 Wat9 0.14900 0.00000 0.68200 0.73000 0.11000