data_global _chemical_name_mineral 'Muscovite' loop_ _publ_author_name 'Comodi P' 'Zanazzi P F' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 22 _journal_year 1995 _journal_page_first 170 _journal_page_last 177 _publ_section_title ; High-pressure structural study of muscovite Sample: K-Ms, P = 0.05 GPa ; _database_code_amcsd 0007908 _chemical_formula_sum 'K.9 Na.07 Ba.01 Al2.8 Ti.04 Fe.08 Mg.04 Si3.04 O12 H2' _cell_length_a 5.194 _cell_length_b 9.013 _cell_length_c 20.064 _cell_angle_alpha 90 _cell_angle_beta 95.8 _cell_angle_gamma 90 _cell_volume 934.458 _exptl_crystal_density_diffrn 2.847 _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 _atom_site_U_iso_or_equiv K 0.00000 0.09840 0.25000 0.90000 0.02320 Na 0.00000 0.09840 0.25000 0.07000 0.02320 Ba 0.00000 0.09840 0.25000 0.01000 0.02320 AlM2 0.24910 0.08300 0.00050 0.92000 0.00750 TiM2 0.24910 0.08300 0.00050 0.02000 0.00750 FeM2 0.24910 0.08300 0.00050 0.04000 0.00750 MgM2 0.24910 0.08300 0.00050 0.02000 0.00750 SiT1 0.96530 0.43010 0.13500 0.76000 0.00710 AlT1 0.96530 0.43010 0.13500 0.24000 0.00710 SiT2 0.45110 0.25870 0.13510 0.76000 0.00790 AlT2 0.45110 0.25870 0.13510 0.24000 0.00790 O1 0.96230 0.44460 0.05100 1.00000 0.00900 O2 0.38320 0.25080 0.05360 1.00000 0.00960 O3 0.41540 0.09390 0.16880 1.00000 0.01520 O4 0.75000 0.31000 0.15760 1.00000 0.01720 O5 0.25040 0.37060 0.17040 1.00000 0.01210 O-h 0.95800 0.06230 0.05190 1.00000 0.01050 H 0.11800 0.14300 0.43900 1.00000 0.20000