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 = 2.9 GPa ; _database_code_amcsd 0006651 _chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8' _cell_length_a 8.3722 _cell_length_b 12.899 _cell_length_c 7.1328 _cell_angle_alpha 90.38 _cell_angle_beta 116.290 _cell_angle_gamma 87.93 _cell_volume 690.128 _exptl_crystal_density_diffrn 2.676 _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 0.27520 -0.00630 0.13660 0.98600 0.02723 NaM 0.27520 -0.00630 0.13660 0.01400 0.02723 AlT1o 0.00240 0.18900 0.21710 0.94400 0.01672 SiT1o 0.00240 0.18900 0.21710 0.05600 0.01672 AlT1m 0.00370 0.81830 0.22860 0.06800 0.01773 SiT1m 0.00370 0.81830 0.22860 0.93200 0.01773 AlT2o 0.70180 0.11990 0.33940 0.00900 0.01608 SiT2o 0.70180 0.11990 0.33940 0.99100 0.01608 AlT2m 0.69720 0.88680 0.34760 0.00900 0.01748 SiT2m 0.69720 0.88680 0.34760 0.99100 0.01748 Oa1 -0.00120 0.14370 -0.01450 1.00000 0.02064 Oa2 0.62300 0.00810 0.28650 1.00000 0.02166 Obo 0.80660 0.14790 0.21140 1.00000 0.02343 Obm 0.82010 0.86110 0.22700 1.00000 0.03103 Oco 0.02400 0.31890 0.25480 1.00000 0.02710 Ocm 0.02890 0.69320 0.27310 1.00000 0.02128 Odo 0.18560 0.12340 0.40650 1.00000 0.02533 Odm 0.17580 0.87420 0.41220 1.00000 0.02318