data_global _chemical_name_mineral 'Holtite' loop_ _publ_author_name 'Groat L A' 'Grew E S' 'Evans R J' 'Pieczka A' 'Ercit T S' _journal_name_full 'Mineralogical Magazine' _journal_volume 73 _journal_year 2009 _journal_page_first 1033 _journal_page_last 1050 _publ_section_title ; The crystal chemistry of holtite Sample: H4 ; _database_code_amcsd 0019928 _chemical_compound_source 'Mt. Szklana Mine, Szklary, Zabkowice, Lower Silesia, Poland' _chemical_formula_sum 'Al6.54 Ta.11 Si2.186 Sb.62 As.22 B O17.186' _cell_length_a 4.7264 _cell_length_b 11.981 _cell_length_c 20.566 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1164.591 _exptl_crystal_density_diffrn 3.625 _symmetry_space_group_name_H-M 'P n m a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-z' '1/2+x,y,1/2-z' '1/2-x,-y,1/2+z' '-x,-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 Al1 0.40480 0.75000 0.25040 0.62000 0.03000 Ta1 0.40480 0.75000 0.25040 0.11000 0.03000 Al2 0.55770 0.61070 0.47330 1.00000 0.01200 Al3 0.05940 0.48930 0.43110 1.00000 0.01000 Al4 0.05960 0.35770 0.28940 0.96000 0.01300 Si1 0.08900 0.75000 0.40800 0.72600 0.01800 Sb1 0.11300 0.75000 0.38640 0.22000 0.01600 As1 0.11300 0.75000 0.38640 0.06000 0.01600 Si2 0.59100 0.52250 0.32950 0.73000 0.00900 Sb2 0.61000 0.55960 0.31710 0.20000 0.01500 As2 0.61000 0.55960 0.31710 0.08000 0.01500 B 0.23400 0.25000 0.41600 1.00000 0.01700 O1 0.37600 0.75000 0.45660 1.00000 0.01300 O2 0.15900 0.75000 0.32860 0.72600 0.02200 O3 0.89100 0.63810 0.42470 1.00000 0.01300 O4 0.40100 0.43630 0.28240 1.00000 0.01200 O5 0.39200 0.55130 0.39480 1.00000 0.01000 O6 0.88600 0.44750 0.35180 1.00000 0.01300 O7 0.65800 0.63500 0.28800 0.73000 0.02200 O8 0.17800 0.25000 0.34980 1.00000 0.01200 O9 0.25300 0.35040 0.44740 1.00000 0.01800 O10 0.76900 0.25000 0.27300 1.00000 0.01400 O11 0.74900 0.46830 0.48710 1.00000 0.00700