data_global _chemical_name_mineral 'Dawsonite' loop_ _publ_author_name 'Chinh L T' 'Pobedimskaya E A' 'Khomyakov A P' _journal_name_full 'Vestnik Moskovskogo Universiteta Geologiya' _journal_volume 42 _journal_year 1987 _journal_page_first 74 _journal_page_last 77 _publ_section_title ; Crystal structure of dawsonite, NaAl(CO3)(OH)2 and its first discovery in the Khibiny alkaline massiv ; _database_code_amcsd 0015709 _chemical_compound_source 'Khibiny alkaline massif, Kola peninsula, Russia' _chemical_formula_sum 'Na Al C O5 H2' _cell_length_a 6.762 _cell_length_b 10.428 _cell_length_c 5.593 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 394.386 _exptl_crystal_density_diffrn 2.425 _symmetry_space_group_name_H-M 'I 2 c m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' 'x,-y,1/2+z' '1/2+x,1/2-y,+z' 'x,y,1/2-z' '1/2+x,1/2+y,-z' 'x,-y,-z' '1/2+x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Na 0.74010 0.74950 0.25000 0.02368 Al -0.00400 0.00000 0.00000 0.00874 C -0.01800 0.75140 0.75000 0.00975 O1 -0.01500 0.36750 0.25000 0.01798 O2 -0.00150 0.81490 0.54880 0.01672 O3 0.16820 -0.02220 0.25000 0.00393 O4 0.80040 -0.02950 0.25000 0.02128 H1 0.22640 0.48370 0.25000 ? H2 0.76490 0.46590 0.25000 ?