data_global _chemical_name_mineral 'Natrite' loop_ _publ_author_name 'Arakcheeva A' 'Bindi L' 'Pattison P' 'Meisser N' 'Chapuis G' 'Pekov I' _journal_name_full 'American Mineralogist' _journal_volume 95 _journal_year 2010 _journal_page_first 574 _journal_page_last 581 _publ_section_title ; The incommensurately modulated structures of natural natrite at 120 and 293 K from synchrotron X-ray data T = 293 K ; _database_code_amcsd 0005043 _chemical_compound_source 'Mt. Koashva, Khibiny massif, Kola peninsula, Russia' _chemical_formula_sum 'Na1.959 C O3' _cell_length_a 8.851 _cell_length_b 5.24 _cell_length_c 6.021 _cell_angle_alpha 90 _cell_angle_beta 101.08 _cell_angle_gamma 90 _cell_volume 274.044 _exptl_crystal_density_diffrn 2.546 _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 0.00000 0.00000 0.00000 0.97700 0.01910 Na2 0.00000 0.00000 0.50000 0.98700 0.01970 Na3 0.17036 0.50000 0.74816 0.97700 0.02710 C 0.16441 0.50000 0.24920 1.00000 0.01450 O1 0.10178 0.29423 0.28557 1.00000 0.03100 O2 0.28986 0.50000 0.17760 1.00000 0.02710