data_global _chemical_name_mineral 'Muscovite' loop_ _publ_author_name 'Richardson S M' 'Richardson J W' _journal_name_full 'American Mineralogist' _journal_volume 67 _journal_year 1982 _journal_page_first 69 _journal_page_last 75 _publ_section_title ; Crystal structure of a pink muscovite from Archer's Post, Kenya: Implications for reverse pleochroism in dioctahedral micas ; _database_code_amcsd 0000854 _chemical_formula_sum 'K Si3 Al3 O12 H2' _cell_length_a 5.1988 _cell_length_b 9.0266 _cell_length_c 20.1058 _cell_angle_alpha 90 _cell_angle_beta 95.782 _cell_angle_gamma 90 _cell_volume 938.715 _exptl_crystal_density_diffrn 2.818 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-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 K 0.00000 0.09920 0.25000 1.00000 Si1 0.45100 0.25870 0.13550 0.75000 Al1 0.45100 0.25870 0.13550 0.25000 Si2 0.03540 0.42980 0.36460 0.75000 Al2 0.03540 0.42980 0.36460 0.25000 Al3 0.25060 0.08380 0.00020 1.00000 O1 0.38720 0.25250 0.05430 1.00000 O2 0.03660 0.44310 0.44590 1.00000 O3 0.41780 0.09310 0.16850 1.00000 O4 0.24750 0.37120 0.16850 1.00000 O5 0.25090 0.31320 0.34240 1.00000 O-H6 0.04220 0.06220 0.44920 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 K 0.02548 0.03467 0.04034 0.00000 0.00482 0.00000 Si1 0.01545 0.01940 0.03041 -0.00118 0.00419 0.00183 Al1 0.01559 0.01940 0.03041 -0.00118 0.00419 0.00183 Si2 0.01355 0.02105 0.02838 -0.00237 0.00314 -0.00091 Al2 0.01355 0.02105 0.02838 -0.00237 0.00314 -0.00091 Al3 0.00989 0.01858 0.02635 0.00000 0.00105 0.00183 O1 0.02345 0.02807 0.03446 -0.00237 0.00629 0.00000 O2 0.02155 0.02724 0.03446 0.00378 0.00157 0.00732 O3 0.03483 0.03467 0.03446 0.00095 0.00629 0.00091 O4 0.02087 0.03632 0.04054 0.00402 0.00210 0.00274 O5 0.02656 0.03921 0.04662 0.00213 0.00210 -0.00640 O-H6 0.02656 0.03344 0.03649 -0.00426 0.00524 0.00091