data_global _chemical_name_mineral 'Orthoclase' loop_ _publ_author_name 'Colville A A' 'Ribbe P H' _journal_name_full 'American Mineralogist' _journal_volume 53 _journal_year 1968 _journal_page_first 25 _journal_page_last 37 _publ_section_title ; The crystal structure of an adularia and a refinement of the structure of orthoclase ; _database_code_amcsd 0000167 _chemical_compound_source 'St. Gotthard, Switzerland, known as Spencer C' _chemical_formula_sum 'K (Si3 Al) O8' _cell_length_a 8.561 _cell_length_b 12.996 _cell_length_c 7.192 _cell_angle_alpha 90 _cell_angle_beta 116.01 _cell_angle_gamma 90 _cell_volume 719.129 _exptl_crystal_density_diffrn 2.571 _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 _atom_site_U_iso_or_equiv K 0.28380 0.00000 0.13730 1.00000 0.02824 Si1 0.00950 0.18440 0.22390 0.65000 0.01153 Al1 0.00950 0.18440 0.22390 0.35000 0.01153 Si2 0.70890 0.11780 0.34430 0.85000 0.01013 Al2 0.70890 0.11780 0.34430 0.15000 0.01013 OA1 0.00000 0.14590 0.00000 1.00000 0.02280 OA2 0.63460 0.00000 0.28510 1.00000 0.02280 OB 0.82800 0.14700 0.22820 1.00000 0.02786 OC 0.03490 0.31060 0.26070 1.00000 0.02153 OD 0.18150 0.12580 0.40650 1.00000 0.02026