data_global _chemical_name_mineral 'Phlogopite' loop_ _publ_author_name 'Hendricks S B' 'Jefferson M E' _journal_name_full 'American Mineralogist' _journal_volume 24 _journal_year 1939 _journal_page_first 729 _journal_page_last 771 _publ_section_title ; Polymorphism of the micas with optical measurements Note: data is reproduced from Jackson and West (1930) ; _database_code_amcsd 0000025 _chemical_formula_sum 'K Mg3 (Si3 Al) O11 (F H)' _cell_length_a 5.32 _cell_length_b 9.21 _cell_length_c 20.08 _cell_angle_alpha 90 _cell_angle_beta 95 _cell_angle_gamma 90 _cell_volume 980.120 _exptl_crystal_density_diffrn 2.841 _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 0.08300 0.25000 1.00000 Mg1 0.25000 0.08300 0.00000 1.00000 Mg2 0.75000 0.25000 0.00000 1.00000 Si1 -0.03300 -0.25000 0.13500 0.75000 Si2 -0.03300 0.41700 0.13500 0.75000 Al1 -0.03300 -0.25000 0.13500 0.25000 Al2 -0.03300 0.41700 0.13500 0.25000 O1 0.22800 0.33300 0.16400 1.00000 O2 0.22800 -0.16700 0.16400 1.00000 O3 0.48000 0.08300 0.16400 1.00000 O4 -0.06200 -0.16700 0.05500 1.00000 O5 -0.06200 0.41700 0.05500 1.00000 O-H -0.06200 0.08300 0.05800 0.50000 F -0.06200 0.08300 0.05800 0.50000