data_global _chemical_name_mineral 'Orthoclase' loop_ _publ_author_name 'Kimata M' 'Saito S' 'Shimizu M' 'Iida I' 'Matsui T' _journal_name_full 'Neues Jahrbuch fur Mineralogie, Abhandlungen' _journal_volume 171 _journal_year 1996 _journal_page_first 199 _journal_page_last 213 _publ_section_title ; Low-temperature structures of orthoclase and sanidine Note: T = 121 K ; _database_code_amcsd 0020548 _chemical_compound_source 'Itrongay, Madagascar' _chemical_formula_sum 'K (Si3 Al) O8' _cell_length_a 8.574 _cell_length_b 13.006 _cell_length_c 7.191 _cell_angle_alpha 90 _cell_angle_beta 116.07 _cell_angle_gamma 90 _cell_volume 720.307 _exptl_crystal_density_diffrn 2.567 _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 0.28410 0.00000 0.13750 1.00000 SiT1 0.00910 0.18480 0.22370 0.64800 AlT1 0.00910 0.18480 0.22370 0.35200 SiT2 0.70850 0.11770 0.34370 0.85200 AlT2 0.70850 0.11770 0.34370 0.14800 Oa1 0.00000 0.14530 0.00000 1.00000 Oa2 0.63720 0.00000 0.28420 1.00000 Ob 0.82670 0.14660 0.22610 1.00000 Oc 0.03410 0.31150 0.25840 1.00000 Od 0.18090 0.12560 0.40640 1.00000