data_global _chemical_name_mineral 'Mendozite' loop_ _publ_author_name 'Fang J H' 'Robinson P D' _journal_name_full 'American Mineralogist' _journal_volume 57 _journal_year 1972 _journal_page_first 1081 _journal_page_last 1088 _publ_section_title ; Crystal structures and mineral chemistry of double-salt hydrates: II. The crystal structure of mendozite, NaAl(SO4)2.11H2O ; _database_code_amcsd 0000289 _chemical_formula_sum 'Na Al S2 O19 H22' _cell_length_a 21.75 _cell_length_b 9.11 _cell_length_c 8.30 _cell_angle_alpha 90 _cell_angle_beta 92.47 _cell_angle_gamma 90 _cell_volume 1643.055 _exptl_crystal_density_diffrn 1.780 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-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_U_iso_or_equiv Na 0.00000 0.00000 0.00000 0.02596 Al 0.25000 0.25000 0.00000 0.01267 S 0.13140 0.25320 0.52950 0.01545 O1 0.14610 0.39550 0.61070 0.02305 O2 0.07470 0.19260 0.59030 0.03242 O3 0.18400 0.15440 0.56540 0.03154 O4 0.12480 0.27580 0.35480 0.03040 Wat1 0.23060 0.30240 0.21000 0.02368 Wat2 0.18320 0.12310 0.98570 0.02356 Wat3 0.19790 0.40370 0.91930 0.02001 Wat4 0.00000 0.12310 0.25000 0.03787 Wat5 0.06830 0.18640 0.91610 0.02850 Wat6 0.03580 0.42910 0.11010 0.04661