data_global _chemical_name_mineral 'Hejtmanite' loop_ _publ_author_name 'Rastsvetaeva R K' 'Tamazyan R A' 'Sokolova E V' 'Belakovskii D I' _journal_name_full 'Soviet Physics Crystallography' _journal_volume 36 _journal_year 1991 _journal_page_first 186 _journal_page_last 189 _publ_section_title ; Crystal structures of two modifications of natural Ba, Mn-titanosilicate Note: sample I ; _database_code_amcsd 0020128 _chemical_compound_source 'Inyl'chek ridge, southeast Kirgiziya' _chemical_formula_sum 'Ba Mn2 Ti Si2 O10 H2' _cell_length_a 5.361 _cell_length_b 6.906 _cell_length_c 12.556 _cell_angle_alpha 90 _cell_angle_beta 119.8 _cell_angle_gamma 90 _cell_volume 403.391 _exptl_crystal_density_diffrn 4.226 _symmetry_space_group_name_H-M 'P 1 21/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+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 Ba 0.28960 0.25000 0.53430 0.02026 Mn1 0.50810 0.25000 0.00920 0.01900 Mn2 0.00000 0.00000 0.00000 0.01900 Ti 0.50080 0.25000 0.28840 0.02406 Si 0.04200 0.02700 0.74890 0.01900 O1 0.78100 -0.00300 0.10200 0.01013 O-H2 0.74600 0.25000 0.91900 0.00887 O-H3 0.72600 0.25000 0.48100 0.03673 O4 0.31600 0.25000 0.12200 0.02153 O5 0.88700 0.25000 0.72000 0.05319 O6 0.79500 0.05100 0.31400 0.04306 O7 0.28000 0.05000 0.31600 0.05193