data_global _chemical_name_mineral 'Albite' loop_ _publ_author_name 'Keefer K D' 'Brown G E' _journal_name_full 'American Mineralogist' _journal_volume 63 _journal_year 1978 _journal_page_first 1264 _journal_page_last 1273 _publ_section_title ; Crystal structures and compositions of sanidine and high albite in cryptoperthitic intergrowth Note this sample of feldspar is from the Rabb Canyon pegmatite, Grant County, New Mexico, USA ; _database_code_amcsd 0000694 _chemical_formula_sum '(Na.8 K.2) (Si3 Al) O8' _cell_length_a 8.144 _cell_length_b 12.989 _cell_length_c 7.160 _cell_angle_alpha 92.10 _cell_angle_beta 116.56 _cell_angle_gamma 90.21 _cell_volume 676.846 _exptl_crystal_density_diffrn 2.605 _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 Na 0.26900 0.00480 0.13190 0.80000 K 0.26900 0.00480 0.13190 0.20000 Si1o 0.00780 0.16940 0.21820 0.75000 Al1o 0.00780 0.16940 0.21820 0.25000 Si1m 0.00570 0.81750 0.22610 0.75000 Al1m 0.00570 0.81750 0.22610 0.25000 Si2o 0.68930 0.11040 0.32870 0.75000 Al2o 0.68930 0.11040 0.32870 0.25000 Si2m 0.68570 0.88020 0.34840 0.75000 Al2m 0.68570 0.88020 0.34840 0.25000 Oa1 0.00350 0.13590 0.99140 1.00000 Oa2 0.59130 0.99430 0.28210 1.00000 Obo 0.82160 0.11450 0.21080 1.00000 Obm 0.81840 0.85520 0.23780 1.00000 Oco 0.01520 0.29590 0.26580 1.00000 Ocm 0.02020 0.68930 0.23290 1.00000 Odo 0.19650 0.11680 0.39500 1.00000 Odm 0.19180 0.87100 0.41900 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 Na 0.02714 0.12200 0.07405 0.00431 0.00614 -0.04753 K 0.02714 0.12200 0.07405 0.00431 0.00614 -0.04753 Si1o 0.01693 0.02559 0.00747 -0.00096 0.00543 0.00000 Al1o 0.01693 0.02559 0.00747 -0.00096 0.00543 0.00000 Si1m 0.01585 0.02559 0.00747 0.00287 0.00401 0.00210 Al1m 0.01585 0.02559 0.00747 0.00287 0.00401 0.00210 Si2o 0.01343 0.02474 0.01037 0.00000 0.00283 0.00126 Al2o 0.01343 0.02474 0.01037 0.00000 0.00283 0.00126 Si2m 0.01370 0.02474 0.00933 0.00144 0.00307 0.00126 Al2m 0.01370 0.02474 0.00933 0.00144 0.00307 0.00126 Oa1 0.03359 0.03583 0.01825 -0.00048 0.01393 -0.00126 Oa2 0.01908 0.02986 0.01887 -0.00096 0.00614 0.00042 Obo 0.02176 0.04607 0.03194 -0.00527 0.01747 -0.00126 Obm 0.02391 0.05204 0.02530 0.00622 0.01133 -0.00042 Oco 0.02418 0.03413 0.02012 -0.00479 0.00755 -0.00168 Ocm 0.02391 0.02901 0.01991 0.00479 0.00354 0.00252 Odo 0.02445 0.03413 0.01597 0.00431 0.00425 0.00337 Odm 0.02687 0.03327 0.01431 -0.00192 -0.00236 -0.00252