data_global _chemical_name_mineral 'Muscovite' loop_ _publ_author_name 'Catti M' 'Ferraris G' 'Ivaldi G' _journal_name_full 'European Journal of Mineralogy' _journal_volume 1 _journal_year 1989 _journal_page_first 625 _journal_page_last 632 _publ_section_title ; Thermal strain analysis in the crystal structure of muscovite at 700 C T = 25 C ; _database_code_amcsd 0006358 _chemical_formula_sum 'K.88 Na.11 Al2.84 Fe.06 Mg.02 Si3.08 O12 H2' _cell_length_a 5.191 _cell_length_b 9.006 _cell_length_c 20.068 _cell_angle_alpha 90 _cell_angle_beta 95.77 _cell_angle_gamma 90 _cell_volume 933.429 _exptl_crystal_density_diffrn 2.831 _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 0.09890 0.25000 0.88000 0.02356 Na 0.00000 0.09890 0.25000 0.11000 0.02356 Al 0.25020 0.08340 0.00010 0.96000 0.01026 Fe 0.25020 0.08340 0.00010 0.03000 0.01026 Mg 0.25020 0.08340 0.00010 0.01000 0.01026 AlT1 0.46500 0.92980 0.13540 0.23000 0.01140 SiT1 0.46500 0.92980 0.13540 0.77000 0.01140 AlT2 0.45130 0.25850 0.13550 0.23000 0.01153 SiT2 0.45130 0.25850 0.13550 0.77000 0.01153 O1 0.41460 0.09320 0.16850 1.00000 0.01748 O2 0.25190 0.80960 0.15730 1.00000 0.01900 O3 0.25150 0.37160 0.16890 1.00000 0.01760 O4 0.46230 0.94420 0.05350 1.00000 0.01279 O5 0.38350 0.25150 0.05340 1.00000 0.01279 O6 0.45770 0.56140 0.05000 1.00000 0.01393 H 0.37100 0.62700 0.05000 1.00000 0.07979