data_global _chemical_name_mineral 'Orthoclase' loop_ _publ_author_name 'Viswanathan K' 'Kielhorn H M' _journal_name_full 'American Mineralogist' _journal_volume 68 _journal_year 1983 _journal_page_first 122 _journal_page_last 124 _publ_section_title ; Al,Si distribution in a ternary (Ba,K,Na)-feldspar as determined by crystal structure refinement Note: variety hyalophane ; _database_code_amcsd 0019651 _chemical_compound_source 'Yugoslavia' _chemical_formula_sum '(Al1.41 Si2.59) (Ba.4 K.47 Na.13) O8' _cell_length_a 8.544 _cell_length_b 13.030 _cell_length_c 7.195 _cell_angle_alpha 90 _cell_angle_beta 115.68 _cell_angle_gamma 90 _cell_volume 721.890 _exptl_crystal_density_diffrn 2.899 _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 Al1 0.00890 0.18350 0.22420 0.43700 Si1 0.00890 0.18350 0.22420 0.56300 Al2 0.70500 0.11790 0.34540 0.26800 Si2 0.70500 0.11790 0.34540 0.73200 Ba 0.28280 0.00000 0.13310 0.40000 K 0.28280 0.00000 0.13310 0.47000 Na 0.28280 0.00000 0.13310 0.13000 Oa1 0.00000 0.14280 0.00000 1.00000 Oa2 0.62640 0.00000 0.28670 1.00000 Ob 0.82730 0.14150 0.22740 1.00000 Oc 0.03030 0.31040 0.25580 1.00000 Od 0.18420 0.12610 0.40300 1.00000 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Al1 0.00390 0.00110 0.00290 -0.00040 0.00240 -0.00020 Si1 0.00390 0.00110 0.00290 -0.00040 0.00240 -0.00020 Al2 0.00350 0.00080 0.00360 -0.00010 0.00210 0.00000 Si2 0.00350 0.00080 0.00360 -0.00010 0.00210 0.00000 Ba 0.00480 0.00240 0.00840 0.00000 0.00270 0.00000 K 0.00480 0.00240 0.00840 0.00000 0.00270 0.00000 Na 0.00480 0.00240 0.00840 0.00000 0.00270 0.00000 Oa1 0.00780 0.00170 0.00640 0.00000 0.00480 0.00000 Oa2 0.00610 0.00080 0.00880 0.00000 0.00220 0.00000 Ob 0.00690 0.00260 0.00910 -0.00070 0.00530 0.00020 Oc 0.00640 0.00150 0.00880 -0.00050 0.00410 -0.00040 Od 0.00390 0.00110 0.00290 -0.00040 0.00240 -0.00020