data_global _chemical_name_mineral 'Microcline' loop_ _publ_author_name 'Allan D R' 'Angel R J' _journal_name_full 'European Journal of Mineralogy' _journal_volume 9 _journal_year 1997 _journal_page_first 263 _journal_page_last 275 _publ_section_title ; A high-pressure structural study of microcline (KAlSi3O8) to 7 GPa P = 4.4 GPa ; _database_code_amcsd 0006652 _chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8' _cell_length_a 8.276 _cell_length_b 12.878 _cell_length_c 7.0936 _cell_angle_alpha 90.38 _cell_angle_beta 116.372 _cell_angle_gamma 87.89 _cell_volume 676.845 _exptl_crystal_density_diffrn 2.729 _symmetry_space_group_name_H-M 'C -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' 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 KM 0.26980 -0.00580 0.13870 0.98600 0.02419 NaM 0.26980 -0.00580 0.13870 0.01400 0.02419 AlT1o -0.00140 0.18840 0.21660 0.94400 0.01659 SiT1o -0.00140 0.18840 0.21660 0.05600 0.01659 AlT1m -0.00110 0.82070 0.22970 0.06800 0.01824 SiT1m -0.00110 0.82070 0.22970 0.93200 0.01824 AlT2o 0.69690 0.12080 0.33760 0.00900 0.01798 SiT2o 0.69690 0.12080 0.33760 0.99100 0.01798 AlT2m 0.69310 0.88650 0.34750 0.00900 0.01874 SiT2m 0.69310 0.88650 0.34750 0.99100 0.01874 Oa1 0.00020 0.14540 -0.01410 1.00000 0.02520 Oa2 0.61640 0.00870 0.28870 1.00000 0.02571 Obo 0.80140 0.14450 0.20380 1.00000 0.02292 Obm 0.81240 0.85900 0.21800 1.00000 0.02723 Oco 0.01820 0.31820 0.25920 1.00000 0.02786 Ocm 0.02270 0.69190 0.27680 1.00000 0.02419 Odo 0.18070 0.12420 0.40630 1.00000 0.02356 Odm 0.16950 0.87600 0.41190 1.00000 0.02584