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: H2 ; _database_code_amcsd 0019926 _chemical_compound_source 'Greenbushes tinfield, Bridgetown-Greenbushes Shire, Australia' _chemical_formula_sum 'Al6.39 Ta.23 Si2.65 Sb.21 As.138 B O17.65' _cell_length_a 4.6981 _cell_length_b 11.926 _cell_length_c 20.413 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 1143.731 _exptl_crystal_density_diffrn 3.586 _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 0.40077 0.75000 0.25027 0.56000 0.01530 Ta1 0.40077 0.75000 0.25027 0.23000 0.01530 Al2 0.55782 0.61049 0.47333 0.99500 0.00530 Al3 0.05953 0.49028 0.43151 0.99000 0.00490 Al4 0.06020 0.35952 0.29005 0.93000 0.00730 Si1 0.08620 0.75000 0.40839 0.88400 0.00500 Sb1 0.11030 0.75000 0.38650 0.05600 0.01030 As1 0.11030 0.75000 0.38650 0.06000 0.01030 Si2 0.58710 0.52053 0.32979 0.88300 0.00540 Sb2 0.60860 0.55890 0.31747 0.07700 0.00930 As2 0.60860 0.55890 0.31747 0.03900 0.00930 B 0.22740 0.25000 0.41550 1.00000 0.00660 O1 0.37740 0.75000 0.45674 1.00000 0.00630 O2 0.16130 0.75000 0.33048 0.88400 0.01060 O3 0.89430 0.63880 0.42516 1.00000 0.00620 O4 0.40350 0.43452 0.28251 1.00000 0.00730 O5 0.39440 0.54984 0.39427 1.00000 0.00630 O6 0.88070 0.45119 0.35208 1.00000 0.00700 O7 0.65860 0.63330 0.28880 0.88300 0.01080 O8 0.17260 0.25000 0.34990 1.00000 0.00870 O9 0.25370 0.35049 0.44776 1.00000 0.00680 O10 0.75760 0.25000 0.27364 1.00000 0.01020 O11 0.75000 0.46710 0.48826 1.00000 0.00520