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 C3-31b from peraluminous granites at Northern Victoria Land, Antarctica ; _database_code_amcsd 0002023 _chemical_formula_sum 'K.93 Na.01 Si3.2 Al2.53 Ti.02 Fe.16 Mg.16 H.34 O12' _cell_length_a 5.197 _cell_length_b 9.022 _cell_length_c 20.076 _cell_angle_alpha 90 _cell_angle_beta 95.79 _cell_angle_gamma 90 _cell_volume 936.508 _exptl_crystal_density_diffrn 2.843 _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 0.09850 0.25000 0.93000 Na 0.00000 0.09850 0.25000 0.01000 Si1 0.45140 0.25841 0.13547 0.80000 Al1 0.45140 0.25841 0.13547 0.20000 Si2 0.96500 0.42973 0.13537 0.80000 Al2 0.96500 0.42973 0.13537 0.20000 Ti2 0.24910 0.08314 0.00003 0.01000 Fe2 0.24910 0.08314 0.00003 0.08000 Mg2 0.24910 0.08314 0.00003 0.08000 Al2 0.24910 0.08314 0.00003 0.83000 Al1 0.75000 0.25000 0.00000 0.07000 H 0.89400 0.13500 0.06900 0.17000 O11 0.74910 0.31160 0.15780 1.00000 O21 0.24870 0.36960 0.16895 1.00000 O22 0.41900 0.09330 0.16840 1.00000 O31 0.38440 0.25180 0.05355 1.00000 O32 0.96120 0.44380 0.05345 1.00000 O4 0.95700 0.06190 0.05038 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 0.02194 0.02268 0.02183 0.00000 0.00230 0.00000 Na 0.02194 0.02268 0.02183 0.00000 0.00230 0.00000 Si1 0.00515 0.00623 0.00930 0.00047 0.00052 0.00009 Al1 0.00515 0.00623 0.00930 0.00047 0.00052 0.00009 Si2 0.00555 0.00602 0.00889 0.00000 0.00094 0.00027 Al2 0.00555 0.00602 0.00889 0.00000 0.00094 0.00027 Ti2 0.00664 0.00713 0.01051 0.00000 0.00078 0.00027 Fe2 0.00664 0.00713 0.01051 0.00000 0.00078 0.00027 Mg2 0.00664 0.00713 0.01051 0.00000 0.00078 0.00027 Al2 0.00664 0.00713 0.01051 0.00000 0.00078 0.00027 O11 0.01192 0.01856 0.01677 -0.00307 -0.00005 0.00374 O21 0.01232 0.01526 0.01415 0.00307 -0.00105 -0.00219 O22 0.01788 0.01155 0.01273 0.00024 0.00209 -0.00018 O31 0.00989 0.00948 0.01172 0.00047 0.00000 0.00128 O32 0.00772 0.00990 0.01031 0.00000 0.00052 0.00027 O4 0.00948 0.01113 0.01314 -0.00071 0.00209 -0.00237