data_global _chemical_name_mineral 'Gotzenite' loop_ _publ_author_name 'Cannillo E' 'Mazzi F' 'Rossi G' _journal_name_full 'Soviet Physics Crystallography' _journal_volume 16 _journal_year 1972 _journal_page_first 1026 _journal_page_last 1030 _publ_section_title ; Crystal structure of gotzenite ; _database_code_amcsd 0015555 _chemical_compound_source 'Mount Shaheru, Republic of Congo' _chemical_formula_sum 'Ca6 Na Ti Si4 O18' _cell_length_a 9.667 _cell_length_b 5.731 _cell_length_c 7.334 _cell_angle_alpha 90 _cell_angle_beta 101.05 _cell_angle_gamma 101.31 _cell_volume 390.740 _exptl_crystal_density_diffrn 3.024 _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 _atom_site_U_iso_or_equiv Ca1 0.63890 0.21150 0.90970 0.00089 Ca2 0.98590 0.49550 0.24180 0.00722 Ca3 0.63050 0.22680 0.40750 0.00215 Na 0.00000 0.00000 0.50000 0.01532 Ti 0.00000 0.00000 0.00000 0.01178 Si1 0.71970 0.74750 0.64600 0.00937 Si2 0.72100 0.74710 0.21000 0.00342 O1 0.76200 0.78400 0.44300 0.02951 O2 0.61900 0.92700 0.67300 0.00025 O3 0.61400 0.92500 0.12700 0.01836 O4 0.63600 0.47200 0.66500 0.02647 O5 0.67500 0.46500 0.16200 0.01381 O6 0.87900 0.81900 0.77800 0.02178 O7 0.88100 0.83000 0.17100 0.01862 O8 0.88400 0.25600 0.96900 0.00355 O9 0.89000 0.31300 0.47500 0.00671