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 = 0.0 GPa ; _database_code_amcsd 0006649 _chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8' _cell_length_a 8.5733 _cell_length_b 12.9375 _cell_length_c 7.2075 _cell_angle_alpha 90.530 _cell_angle_beta 115.972 _cell_angle_gamma 87.968 _cell_volume 718.229 _exptl_crystal_density_diffrn 2.572 _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 0.28410 -0.00710 0.13670 0.98600 0.02495 NaM 0.28410 -0.00710 0.13670 0.01400 0.02495 AlT1o 0.01020 0.18810 0.21800 0.94400 0.01646 SiT1o 0.01020 0.18810 0.21800 0.05600 0.01646 AlT1m 0.00880 0.81820 0.23150 0.06800 0.01646 SiT1m 0.00880 0.81820 0.23150 0.93200 0.01646 AlT2o 0.71050 0.12060 0.34050 0.00900 0.01646 SiT2o 0.71050 0.12060 0.34050 0.99100 0.01646 AlT2m 0.70690 0.88640 0.34970 0.00900 0.01697 SiT2m 0.70690 0.88640 0.34970 0.99100 0.01697 Oa1 0.00170 0.14060 -0.01570 1.00000 0.02191 Oa2 0.63960 0.00500 0.28590 1.00000 0.01912 Obo 0.82110 0.14990 0.22050 1.00000 0.02482 Obm 0.83240 0.85580 0.23800 1.00000 0.02634 Oco 0.03470 0.32140 0.25300 1.00000 0.02254 Ocm 0.03840 0.69120 0.26840 1.00000 0.02090 Odo 0.18840 0.12530 0.40450 1.00000 0.02014 Odm 0.17680 0.87000 0.41020 1.00000 0.02115