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 RA1 from a pegmatite on Antarctica ; _database_code_amcsd 0002014 _chemical_formula_sum '(K.92 Na.08) Si3.2 Al2.65 Ti.04 Fe.12 Mg.06 O12' _cell_length_a 5.182 _cell_length_b 8.982 _cell_length_c 20.002 _cell_angle_alpha 90 _cell_angle_beta 95.72 _cell_angle_gamma 90 _cell_volume 926.352 _exptl_crystal_density_diffrn 2.877 _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 0.09820 0.25000 0.92000 Na 0.00000 0.09820 0.25000 0.08000 Si1 0.45130 0.25857 0.13560 0.80000 Al1 0.45130 0.25857 0.13560 0.20000 Si2 0.96490 0.42962 0.13554 0.80000 Al2 0.96490 0.42962 0.13554 0.20000 Ti2 0.24960 0.08332 0.00005 0.02000 Fe2 0.24960 0.08332 0.00005 0.06000 Mg2 0.24960 0.08332 0.00005 0.03000 Al2 0.24960 0.08332 0.00005 0.89000 Al1 0.75000 0.25000 0.00000 0.07000 O11 0.75020 0.31030 0.15785 1.00000 O21 0.24950 0.37000 0.16908 1.00000 O22 0.41700 0.09350 0.16837 1.00000 O31 0.38510 0.25190 0.05348 1.00000 O32 0.96220 0.44430 0.05363 1.00000 O4 0.95690 0.06170 0.05025 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 0.02734 0.02984 0.03331 0.00000 0.00234 0.00000 Na 0.02734 0.02984 0.03331 0.00000 0.00234 0.00000 Si1 0.01024 0.01222 0.02107 -0.00054 0.00083 0.00000 Al1 0.01024 0.01222 0.02107 -0.00054 0.00083 0.00000 Si2 0.00997 0.00911 0.02207 0.00014 0.00146 0.00009 Al2 0.00997 0.00911 0.02207 0.00014 0.00146 0.00009 Ti2 0.01199 0.01316 0.02247 -0.00059 0.00094 0.00063 Fe2 0.01199 0.01316 0.02247 -0.00059 0.00094 0.00063 Mg2 0.01199 0.01316 0.02247 -0.00059 0.00094 0.00063 Al2 0.01199 0.01316 0.02247 -0.00059 0.00094 0.00063 O11 0.01643 0.01757 0.02970 -0.00516 0.00052 0.00426 O21 0.01724 0.01962 0.02468 0.00258 0.00000 -0.00072 O22 0.02182 0.01390 0.02890 -0.00235 0.00416 0.00063 O31 0.01266 0.01676 0.02408 -0.00023 0.00104 0.00082 O32 0.01360 0.01512 0.02448 0.00070 0.00052 0.00082 O4 0.01010 0.01349 0.02689 -0.00188 0.00312 -0.00163