data_global _chemical_name_mineral 'Ussingite' loop_ _publ_author_name 'Rossi G' 'Tazzoli V' 'Ungaretti L' _journal_name_full 'American Mineralogist' _journal_volume 59 _journal_year 1974 _journal_page_first 335 _journal_page_last 340 _publ_section_title ; The crystal structure of ussingite ; _database_code_amcsd 399 _chemical_compound_source 'Lovozero alkali massif, Russia' _chemical_formula_sum 'Al Si3 Na2 H O9' _cell_length_a 7.256 _cell_length_b 7.686 _cell_length_c 8.683 _cell_angle_alpha 90.75 _cell_angle_beta 99.75 _cell_angle_gamma 122.48 _cell_volume 399.436 _exptl_crystal_density_diffrn 2.513 _symmetry_space_group_name_H-M 'P -1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Al 0.2422 0.0457 0.8551 Si1 0.2463 0.1935 0.3626 Si2 0.3203 0.4147 0.6924 Si3 0.7014 0.1041 0.8129 Na1 0.1759 0.3924 0.0555 Na2 0.8214 0.2342 0.4421 H 0.979 0.405 0.765 O1 0.0021 0.1358 0.2792 O2 0.1419 0.4749 0.6515 O3 0.2767 -0.0021 0.3473 O4 0.301 0.297 0.8489 O5 0.4442 0.0224 0.7955 O6 0.4231 0.3818 0.2768 O7 0.798 0.0344 0.9625 O8 0.858 0.3557 0.821 O9 0.2973 0.2604 0.5485 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Al 0.00688 0.00937 0.00898 0.00431 0.0022 0.0021 Si1 0.00658 0.00801 0.00921 0.00355 0.00169 0.00121 Si2 0.00856 0.00847 0.00777 0.00379 0.0025 0.00186 Si3 0.00586 0.01064 0.00889 0.00537 0.00434 0.00284 Na1 0.02672 0.02481 0.01958 0.01665 0.00395 0.0006 Na2 0.02791 0.02109 0.01696 0.01544 0.00549 0.00457 O1 0.01258 0.01546 0.02224 0.00731 0.00272 -0.00029 O2 0.01619 0.02131 0.02211 0.0117 0.00593 0.00809 O3 0.01791 0.01491 0.01129 0.0108 0.00344 0.00207 O4 0.01541 0.01277 0.01137 0.00709 0.00312 0.00165 O5 0.01321 0.01959 0.02036 0.00964 0.00357 0.00212 O6 0.0131 0.01666 0.01492 0.00494 0.00504 0.00467 O7 0.02389 0.03018 0.01395 0.0195 0.00585 0.00789 O8 0.01621 0.01437 0.02431 0.0054 0.00844 0.0 O9 0.02884 0.01974 0.01048 0.01419 0.0032 0.00179