data_9009589 _chemical_name 'Polylithionite' loop_ _publ_author_name 'Sartori F' _journal_name_full "Tschermaks Mineralogische und Petrographische Mitteilungen" _journal_volume 24 _journal_year 1977 _journal_page_first 23 _journal_page_last 37 _publ_section_title ; The crystal structure of a 2M_1 lepidolite Note: This sample is about halfway along the trilithionite-polylithionite join Locality: Biskupice, Moravia, Czech Republic Note: Lepidolite series ; _chemical_formula_sum 'K.775 Rb.06 Cs.02 Na.035 Ca.01 H1.1 Li1.61 Al1.59 Mg.066 _cell_length_a 5.209 _cell_length_b 9.053 _cell_length_c 20.185 _cell_angle_alpha 90 _cell_angle_beta 99.125 _cell_angle_gamma 90 _cell_volume 939.820 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _symmetry_equiv_pos_as_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_Uiso_or_equiv K 0.00000 0.09060 0.25000 0.77500 0.01494 Rb 0.00000 0.09060 0.25000 0.06000 0.01494 Cs 0.00000 0.09060 0.25000 0.02000 0.01494 Na 0.00000 0.09060 0.25000 0.03500 0.01494 Ca 0.00000 0.09060 0.25000 0.01000 0.01494 H3O 0.00000 0.09060 0.25000 0.10000 0.01494 LiM2 0.25000 0.75000 0.00000 0.92000 0.01241 AlM1 0.25500 0.08510 0.00010 0.58500 0.00849 LiM1 0.25500 0.08510 0.00010 0.34500 0.00849 MgM1 0.25500 0.08510 0.00010 0.03300 0.00849 MnM1 0.25500 0.08510 0.00010 0.02500 0.00849 FeM1 0.25500 0.08510 0.00010 0.01200 0.00849 SiT1 0.46140 0.92440 0.13400 0.85000 0.00291 AlT1 0.46140 0.92440 0.13400 0.15000 0.00291 SiT2 0.45580 0.25540 0.13410 0.94000 0.00304 AlT2 0.45580 0.25540 0.13410 0.06000 0.00304 O1 0.44170 0.92810 0.05240 1.00000 0.00950 O2 0.41530 0.25170 0.05290 1.00000 0.01140 O3 0.43960 0.08980 0.16580 1.00000 0.00988 O4 0.23530 0.82170 0.16290 1.00000 0.01343 O5 0.23940 0.35460 0.16700 1.00000 0.01292 O-H 0.44350 0.57010 0.04980 0.24250 0.01659 F 0.44350 0.57010 0.04980 0.75750 0.01659