data_global _chemical_name_mineral 'Muscovite' loop_ _publ_author_name 'Gatineau L' _journal_name_full 'Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences' _journal_volume 256 _journal_year 1963 _journal_page_first 4648 _journal_page_last 4649 _publ_section_title ; Localisation des remplacements isomorphiques dans la muscovite Note: polytype Muscovite 2M1 _cod_database_code 1000042 ; _database_code_amcsd 0012259 _chemical_formula_sum 'K Al3 Si3 O12' _cell_length_a 5.189 _cell_length_b 8.995 _cell_length_c 20.09698 _cell_angle_alpha 90 _cell_angle_beta 95.18 _cell_angle_gamma 90 _cell_volume 934.197 _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 K1 0.00000 0.09890 0.25000 1.00000 Al1 0.25060 0.08500 0.00030 1.00000 Al2 0.46610 0.92820 0.13540 0.25000 Al3 0.45210 0.25750 0.13510 0.25000 Si1 0.46610 0.92820 0.13540 0.75000 Si2 0.45210 0.25750 0.13510 0.75000 O1 0.46300 0.94440 0.05300 1.00000 O2 0.38260 0.25310 0.05330 1.00000 O3 0.45810 0.56100 0.05050 1.00000 O4 0.41630 0.09360 0.16810 1.00000 O5 0.25050 0.80890 0.15660 1.00000 O6 0.25430 0.37120 0.16840 1.00000