data_global _chemical_name_mineral 'Sanidine' loop_ _publ_author_name 'Deubener J' 'Sternitzke M' 'Mueller G' _journal_name_full 'American Mineralogist' _journal_volume 76 _journal_year 1991 _journal_page_first 1620 _journal_page_last 1627 _publ_section_title ; Feldspars MAlSi3O8 (M=H,Li,Ag) synthesized by low-temperature ion exchange ; _database_code_amcsd 0020567 _chemical_compound_source 'Volkesfeld, Eifel, Germany' _chemical_formula_sum 'K (Al Si3) O8' _cell_length_a 8.544 _cell_length_b 13.010 _cell_length_c 7.194 _cell_angle_alpha 90 _cell_angle_beta 115.99 _cell_angle_gamma 90 _cell_volume 718.797 _exptl_crystal_density_diffrn 2.572 _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 K1 0.28140 0.00000 0.12660 1.00000 Al1 0.00740 0.18460 0.23020 0.25000 Si1 0.00740 0.18460 0.23020 0.75000 Al2 0.70870 0.11560 0.34940 0.25000 Si2 0.70870 0.11560 0.34940 0.75000 O1 0.00000 0.16800 0.00000 1.00000 O2 0.63080 0.00000 0.27150 1.00000 O3 0.81930 0.15160 0.22290 1.00000 O4 0.04430 0.30610 0.29780 1.00000 O5 0.16380 0.11400 0.40090 1.00000