data_global _chemical_name_mineral 'Muscovite' loop_ _publ_author_name 'Guven N' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 134 _journal_year 1971 _journal_page_first 196 _journal_page_last 212 _publ_section_title ; The crystal structures of 2M1 phengite and 2M1 muscovite Note: sample 2M1 muscovite ; _database_code_amcsd 0019602 _chemical_compound_source 'pegmatite in Georgia, USA' _chemical_formula_sum 'K.86 Na.1 Al2.9 Fe.04 Mg.06 Si3 O12 H2' _cell_length_a 5.1906 _cell_length_b 9.0080 _cell_length_c 20.0470 _cell_angle_alpha 90 _cell_angle_beta 95.757 _cell_angle_gamma 90 _cell_volume 932.608 _exptl_crystal_density_diffrn 2.821 _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 0.09850 0.25000 0.86000 0.02026 Na 0.00000 0.09850 0.25000 0.10000 0.02026 Al 0.24960 0.08340 0.99990 0.95000 0.00595 Fe 0.24960 0.08340 0.99990 0.02000 0.00595 Mg 0.24960 0.08340 0.99990 0.03000 0.00595 AlT1 0.96480 0.42950 0.13550 0.25000 0.00684 SiT1 0.96480 0.42950 0.13550 0.75000 0.00684 AlT2 0.45100 0.25840 0.13550 0.25000 0.00684 SiT2 0.45100 0.25840 0.13550 0.75000 0.00684 Oa 0.96130 0.44350 0.05400 1.00000 0.01064 Ob 0.38500 0.25190 0.05370 1.00000 0.00975 Oc 0.41740 0.09300 0.16850 1.00000 0.01355 Od 0.75130 0.31100 0.15750 1.00000 0.01697 Oe 0.25220 0.37050 0.16890 1.00000 0.01482 O-H 0.95640 0.06300 0.05050 1.00000 0.00950 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 0.02175 0.02055 0.01814 0.00000 0.00209 0.00000 Na 0.02175 0.02055 0.01814 0.00000 0.00209 0.00000 Al 0.00595 0.00370 0.00746 -0.00007 0.00104 0.00127 Fe 0.00595 0.00370 0.00746 -0.00007 0.00104 0.00127 Mg 0.00595 0.00370 0.00746 -0.00007 0.00104 0.00127 AlT1 0.00635 0.00617 0.00746 0.00047 0.00052 0.00000 SiT1 0.00635 0.00617 0.00746 0.00047 0.00052 0.00000 AlT2 0.00662 0.00617 0.00826 -0.00024 0.00104 0.00000 SiT2 0.00662 0.00617 0.00826 -0.00024 0.00104 0.00000 Oa 0.00811 0.01110 0.01209 0.00094 0.00052 0.00273 Ob 0.00946 0.00822 0.01209 0.00047 0.00052 0.00000 Oc 0.01621 0.01274 0.01411 0.00141 0.00261 0.00000 Od 0.01757 0.02014 0.01411 0.00236 0.00417 0.00273 Oe 0.01757 0.01398 0.01209 0.00094 -0.00104 -0.00455 O-H 0.01081 0.00822 0.00806 0.00047 -0.00104 -0.00273