data_global _chemical_name_mineral 'Orthoclase' loop_ _publ_author_name 'Jones J B' 'Taylor W H' _journal_name_full 'Acta Crystallographica' _journal_volume 14 _journal_year 1961 _journal_page_first 443 _journal_page_last 456 _publ_section_title ; The structure of orthoclase ; _database_code_amcsd 0020547 _chemical_compound_source 'Mogok, Upper Burma' _chemical_formula_sum 'K (Si3.02 Al.98) O8' _cell_length_a 8.5616 _cell_length_b 12.9962 _cell_length_c 7.1934 _cell_angle_alpha 90 _cell_angle_beta 116.015 _cell_angle_gamma 90 _cell_volume 719.300 _exptl_crystal_density_diffrn 2.570 _symmetry_space_group_name_H-M 'C 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,z' '1/2+x,1/2-y,z' '-x,y,-z' '1/2-x,1/2+y,-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy K 0.28430 0.00000 0.13610 1.00000 SiT1 0.01010 0.18480 0.22370 0.70000 AlT1 0.01010 0.18480 0.22370 0.30000 SiT2 0.70840 0.11750 0.34370 0.81000 AlT2 0.70840 0.11750 0.34370 0.19000 Oa1 0.00000 0.14610 0.00000 1.00000 Oa2 0.63350 0.00000 0.28400 1.00000 Ob 0.82760 0.14650 0.22710 1.00000 Oc 0.03470 0.31040 0.26310 1.00000 Od 0.18010 0.12560 0.40510 1.00000