data_global _chemical_name_mineral 'Anorthoclase' loop_ _publ_author_name 'Nestola F' 'Curetti N' 'Benna P' 'Ivaldi G' 'Angel R' 'Bruno E' _journal_name_full 'The Canadian Mineralogist' _journal_volume 46 _journal_year 2008 _journal_page_first 1443 _journal_page_last 1454 _publ_section_title ; Compressibility and high-pressure behavior of Ab63Or27An10 anorthoclase Note: P = 6.0 GPa ; _database_code_amcsd 0006201 _chemical_compound_source 'Torino, Italy' _chemical_formula_sum '(Na.63 K.27 Ca.1) (Al1.1 Si2.9) O8' _cell_length_a 7.890 _cell_length_b 12.720 _cell_length_c 6.960 _cell_angle_alpha 92.46 _cell_angle_beta 116.53 _cell_angle_gamma 90.83 _cell_volume 623.940 _exptl_crystal_density_diffrn 2.855 _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 Na 0.25930 0.00500 0.13780 0.63000 0.05000 K 0.25930 0.00500 0.13780 0.27000 0.05000 Ca 0.25930 0.00500 0.13780 0.10000 0.05000 Al10 0.00180 0.16660 0.22080 0.27500 0.02400 Si10 0.00180 0.16660 0.22080 0.72500 0.02400 Al1m -0.00710 0.81440 0.22220 0.27500 0.02000 Si1m -0.00710 0.81440 0.22220 0.72500 0.02000 Al20 0.68380 0.10740 0.32590 0.27500 0.02200 Si20 0.68380 0.10740 0.32590 0.72500 0.02200 Al2m 0.67160 0.87640 0.35180 0.27500 0.02200 Si2m 0.67160 0.87640 0.35180 0.72500 0.02200 OA1 0.00470 0.13510 0.98710 1.00000 0.03600 OA2 0.57370 0.99080 0.27650 1.00000 0.02600 OB0 0.80450 0.10380 0.19360 1.00000 0.04800 OBm 0.79760 0.84940 0.22010 1.00000 0.04000 OC0 -0.00950 0.29250 0.27000 1.00000 0.02600 OCm 0.00520 0.68720 0.22260 1.00000 0.03000 OD0 0.19280 0.11790 0.39500 1.00000 0.04900 ODm 0.17520 0.87130 0.41190 1.00000 0.03800