data_global _chemical_name_mineral 'Muscovite-2M1' loop_ _publ_author_name 'Brigatti M F' 'Frigieri P' 'Poppi L' _journal_name_full 'American Mineralogist' _journal_volume 83 _journal_year 1998 _journal_page_first 775 _journal_page_last 785 _publ_section_title ; Crystal chemistry of Mg-, Fe-bearing muscovites-2M1 Sample C6Bb from peraluminous granites at Northern Victoria Land, Antarctica ; _database_code_amcsd 0002022 _chemical_formula_sum 'K.93 Na.05 Si2.88 Al2.93 Ti.04 Fe.06 Mg.16 H.28 O11.94 F.06' _cell_length_a 5.196 _cell_length_b 8.997 _cell_length_c 20.034 _cell_angle_alpha 90 _cell_angle_beta 95.80 _cell_angle_gamma 90 _cell_volume 931.763 _exptl_crystal_density_diffrn 2.845 _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 0.09880 0.25000 0.93000 Na 0.00000 0.09880 0.25000 0.05000 Si1 0.45150 0.25858 0.13550 0.72000 Al1 0.45150 0.25858 0.13550 0.28000 Si2 0.96520 0.42995 0.13539 0.72000 Al2 0.96520 0.42995 0.13539 0.28000 Ti2 0.24960 0.08322 0.00005 0.02000 Fe2 0.24960 0.08322 0.00005 0.03000 Mg2 0.24960 0.08322 0.00005 0.08000 Al2 0.24960 0.08322 0.00005 0.87000 Al1 0.75000 0.25000 0.00000 0.07000 H 0.88500 0.16500 0.06200 0.14000 O11 0.75010 0.31190 0.15770 1.00000 O21 0.24800 0.37000 0.16874 1.00000 O22 0.41830 0.09320 0.16835 1.00000 O31 0.38580 0.25170 0.05346 1.00000 O32 0.96070 0.44380 0.05349 1.00000 O4 0.95750 0.06190 0.05033 0.97000 F4 0.95750 0.06190 0.05033 0.03000 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 0.02626 0.02748 0.02576 0.00000 0.00303 0.00000 Na 0.02626 0.02748 0.02576 0.00000 0.00303 0.00000 Si1 0.00975 0.01120 0.01409 0.00024 0.00136 0.00045 Al1 0.00975 0.01120 0.01409 0.00024 0.00136 0.00045 Si2 0.00988 0.01025 0.01429 0.00021 0.00204 0.00027 Al2 0.00988 0.01025 0.01429 0.00021 0.00204 0.00027 Ti2 0.01042 0.01230 0.01429 -0.00047 0.00177 0.00100 Fe2 0.01042 0.01230 0.01429 -0.00047 0.00177 0.00100 Mg2 0.01042 0.01230 0.01429 -0.00047 0.00177 0.00100 Al2 0.01042 0.01230 0.01429 -0.00047 0.00177 0.00100 O11 0.01557 0.02337 0.02435 -0.00188 0.00104 0.00363 O21 0.01489 0.02050 0.01872 0.00448 0.00157 -0.00154 O22 0.02017 0.01927 0.01811 0.00047 0.00209 0.00018 O31 0.01394 0.01353 0.01469 0.00071 0.00209 0.00154 O32 0.01124 0.01517 0.01550 0.00000 0.00261 0.00055 O4 0.01692 0.01722 0.01670 -0.00118 0.00365 -0.00164 F4 0.01692 0.01722 0.01670 -0.00118 0.00365 -0.00164