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 C6Cb from peraluminous granites at Northern Victoria Land, Antarctica ; _database_code_amcsd 0002021 _chemical_formula_sum '(K.92 Na.08) Si3.16 Al2.68 Ti.04 Fe.12 Mg.14 H.26 O11.96 F.04' _cell_length_a 5.186 _cell_length_b 9.003 _cell_length_c 20.030 _cell_angle_alpha 90 _cell_angle_beta 95.84 _cell_angle_gamma 90 _cell_volume 930.338 _exptl_crystal_density_diffrn 2.879 _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 0.09860 0.25000 0.92000 Na 0.00000 0.09860 0.25000 0.08000 Si1 0.45160 0.25845 0.13551 0.79000 Al1 0.45160 0.25845 0.13551 0.21000 Si2 0.96500 0.42949 0.13546 0.79000 Al2 0.96500 0.42949 0.13546 0.21000 Ti2 0.24960 0.08311 0.00002 0.02000 Fe2 0.24960 0.08311 0.00002 0.06000 Mg2 0.24960 0.08311 0.00002 0.07000 Al2 0.24960 0.08311 0.00002 0.85000 Al1 0.75000 0.25000 0.00000 0.14000 H 0.96100 0.09800 0.10600 0.13000 O11 0.75020 0.31040 0.15748 1.00000 O21 0.24940 0.37000 0.16878 1.00000 O22 0.41730 0.09310 0.16831 1.00000 O31 0.38510 0.25150 0.05348 1.00000 O32 0.96120 0.44400 0.05342 1.00000 O4 0.95750 0.06180 0.05027 0.98000 F4 0.95750 0.06180 0.05027 0.02000 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 0.03600 0.02685 0.01770 0.00000 0.00078 0.00000 Na 0.03600 0.02685 0.01770 0.00000 0.00078 0.00000 Si1 0.01739 0.01014 0.00583 0.00024 -0.00078 0.00027 Al1 0.01739 0.01014 0.00583 0.00024 -0.00078 0.00027 Si2 0.01766 0.00981 0.00583 0.00021 -0.00026 0.00073 Al2 0.01766 0.00981 0.00583 0.00021 -0.00026 0.00073 Ti2 0.01996 0.01183 0.00764 -0.00047 -0.00083 0.00073 Fe2 0.01996 0.01183 0.00764 -0.00047 -0.00083 0.00073 Mg2 0.01996 0.01183 0.00764 -0.00047 -0.00083 0.00073 Al2 0.01996 0.01183 0.00764 -0.00047 -0.00083 0.00073 O11 0.02616 0.02217 0.01267 -0.00494 -0.00021 0.00582 O21 0.02548 0.01971 0.01167 0.00447 -0.00208 -0.00254 O22 0.03047 0.01314 0.01126 0.00094 0.00208 0.00036 O31 0.02279 0.01314 0.00744 0.00047 -0.00052 0.00000 O32 0.01996 0.01519 0.00744 0.00047 -0.00052 0.00127 O4 0.02063 0.01437 0.00945 -0.00047 0.00156 -0.00218 F4 0.02063 0.01437 0.00945 -0.00047 0.00156 -0.00218