data_global _chemical_name_mineral 'Sanidine' loop_ _publ_author_name 'Ohashi Y' 'Finger LW' _journal_name_full 'Carnegie Institution of Washington: Yearbook' _journal_volume 74 _journal_year 1975 _journal_page_first 569 _journal_page_last 572 _publ_section_title ; An effect of temperature on the feldspar structure: crystal structure of sanidine at 800C Note: T = 800 C ; _database_code_amcsd 0020566 _chemical_compound_source 'Laacher See, Eifel District, Germany' _chemical_formula_sum '(K.86 Na.14) (Si3 Al) O8' _cell_length_a 8.6820 _cell_length_b 13.0130 _cell_length_c 7.1840 _cell_angle_alpha 90 _cell_angle_beta 115.710 _cell_angle_gamma 90 _cell_volume 731.289 _exptl_crystal_density_diffrn 2.508 _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 0.29240 0.00000 0.14260 0.86000 0.09233 Na 0.29240 0.00000 0.14260 0.14000 0.09233 SiT1 0.01080 0.18670 0.22450 0.68000 0.03154 AlT1 0.01080 0.18670 0.22450 0.32000 0.03154 SiT2 0.71560 0.11850 0.34620 0.82000 0.03103 AlT2 0.71560 0.11850 0.34620 0.18000 0.03103 Oa1 0.00000 0.14890 0.00000 1.00000 0.05142 Oa2 0.65030 0.00000 0.28950 1.00000 0.05028 Ob 0.83260 0.15030 0.23140 1.00000 0.06181 Oc 0.04270 0.31140 0.26150 1.00000 0.05218 Od 0.17550 0.12610 0.40560 1.00000 0.05497