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 = 7.1 GPa ; _database_code_amcsd 0006654 _chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8' _cell_length_a 8.0764 _cell_length_b 12.8471 _cell_length_c 6.9991 _cell_angle_alpha 90.548 _cell_angle_beta 116.830 _cell_angle_gamma 87.903 _cell_volume 647.584 _exptl_crystal_density_diffrn 2.852 _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 0.25860 -0.00350 0.14370 0.98600 0.02343 NaM 0.25860 -0.00350 0.14370 0.01400 0.02343 AlT1o -0.01290 0.19110 0.21340 0.94400 0.01596 SiT1o -0.01290 0.19110 0.21340 0.05600 0.01596 AlT1m -0.01170 0.81850 0.22920 0.06800 0.01874 SiT1m -0.01170 0.81850 0.22920 0.93200 0.01874 AlT2o 0.69120 0.11990 0.33570 0.00900 0.01722 SiT2o 0.69120 0.11990 0.33570 0.99100 0.01722 AlT2m 0.68560 0.88660 0.34760 0.00900 0.01722 SiT2m 0.68560 0.88660 0.34760 0.99100 0.01722 Oa1 0.00040 0.15290 -0.01450 1.00000 0.02026 Oa2 0.60640 0.00570 0.29010 1.00000 0.02989 Obo 0.78190 0.14910 0.18270 1.00000 0.02254 Obm 0.78870 0.86120 0.19800 1.00000 0.02204 Oco 0.00640 0.31810 0.27310 1.00000 0.02584 Ocm 0.01960 0.68640 0.28750 1.00000 0.02634 Odo 0.17070 0.12220 0.40740 1.00000 0.02533 Odm 0.15740 0.87860 0.41540 1.00000 0.02292