data_global _chemical_name_mineral 'Natroapophyllite' loop_ _publ_author_name 'Miura Y' 'Kato T' 'Rucklidge J C' 'Matsueda H' _journal_name_full 'American Mineralogist' _journal_volume 66 _journal_year 1981 _journal_page_first 410 _journal_page_last 423 _publ_section_title ; Natroapophyllite, a new orthorhombic sodium analog of apophyllite II. Crystal structure ; _database_code_amcsd 0000829 _chemical_formula_sum 'Si8 Ca4 Na F O28 H16' _cell_length_a 8.875 _cell_length_b 8.881 _cell_length_c 15.79 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1244.550 _exptl_crystal_density_diffrn 2.378 _symmetry_space_group_name_H-M 'P n n m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-z' 'x,y,-z' '-x,-y,z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Si1 0.22890 0.08330 0.18900 0.01418 Si2 0.41610 0.27080 0.31080 0.01431 Ca1 0.11430 0.24650 0.00000 0.01520 Ca2 0.75370 0.11480 0.00000 0.01583 Na 0.00000 0.00000 0.50000 0.03597 F 0.00000 0.00000 0.00000 0.02368 O1 0.36710 0.13220 0.25130 0.01722 O2 0.08820 0.19020 0.21620 0.02064 O21 0.30990 0.41230 0.28390 0.02014 O3 0.26960 0.09870 0.09210 0.02216 O31 0.40160 0.23050 0.40790 0.02102 O4 0.22860 0.45050 0.08870 0.03103 O41 0.55020 0.22530 0.08900 0.03420 H1 0.47000 0.17000 0.05000 0.02026 H11 0.17000 0.54000 0.08000 0.01773 H2 0.16000 0.43000 0.14000 0.01013 H21 0.56000 0.31000 0.14000 0.04053