data_global _chemical_name_mineral 'Ferri-eckermannite' loop_ _publ_author_name 'Hawthorne F C' 'Ungaretti L' 'Oberti R' 'Cannillo E' _journal_name_full 'American Mineralogist' _journal_volume 79 _journal_year 1994 _journal_page_first 443 _journal_page_last 451 _publ_section_title ; The mechanism of Li incorporation in amphiboles Sample: A4 Note: Site occupancies are set to be the same as ones in sample A5 ; _database_code_amcsd 0001658 _chemical_formula_sum 'Si7.92 Al.16 Mg3.34 Fe1.174 Mn.126 Ti.04 Li.24 Na2.45 Ca.1 K.2 H2 O23.58 F.42' _cell_length_a 9.771 _cell_length_b 17.887 _cell_length_c 5.289 _cell_angle_alpha 90 _cell_angle_beta 103.82 _cell_angle_gamma 90 _cell_volume 897.619 _exptl_crystal_density_diffrn 3.106 _symmetry_space_group_name_H-M 'C 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,z' '1/2+x,1/2-y,z' '-x,y,-z' '1/2-x,1/2+y,-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 Si1 0.28050 0.08570 0.29300 0.99000 0.00494 Al1 0.28050 0.08570 0.29300 0.01000 0.00494 Si2 0.28850 0.17140 0.80170 0.99000 0.00507 Al2 0.28850 0.17140 0.80170 0.01000 0.00507 Mg1 0.00000 0.08820 0.50000 0.93000 0.00659 All 0.00000 0.08820 0.50000 0.04000 0.00659 Fe1 0.00000 0.08820 0.50000 0.02700 0.00659 Mn1 0.00000 0.08820 0.50000 0.00300 0.00659 Mg2 0.00000 0.18090 0.00000 0.36000 0.00595 Ti2 0.00000 0.18090 0.00000 0.02000 0.00595 Fe2 0.00000 0.18090 0.00000 0.56000 0.00595 Mn2 0.00000 0.18090 0.00000 0.06000 0.00595 Li3 0.00000 0.00000 0.00000 0.24000 0.00684 Mg3 0.00000 0.00000 0.00000 0.76000 0.00684 Na4 0.00000 0.27650 0.50000 0.95000 0.01381 Ca4 0.00000 0.27650 0.50000 0.05000 0.01381 NaA 0.00000 0.50000 0.00000 0.11000 0.06434 KA 0.00000 0.50000 0.00000 0.04000 0.06434 NaAm 0.04780 0.50000 0.10350 0.11000 0.03711 KAm 0.04780 0.50000 0.10350 0.04000 0.03711 NaA2 0.00000 0.46780 0.00000 0.11000 0.05725 KA2 0.00000 0.46780 0.00000 0.04000 0.05725 H 0.18910 0.00000 0.75470 1.00000 0.05231 O1 0.11120 0.08810 0.21370 1.00000 0.00684 O2 0.11820 0.16950 0.73260 1.00000 0.00722 O-h3 0.10890 0.00000 0.70830 0.79000 0.00963 F3 0.10890 0.00000 0.70830 0.21000 0.00963 O4 0.36290 0.25040 0.79970 1.00000 0.00937 O5 0.34930 0.12950 0.08480 1.00000 0.00950 O6 0.34250 0.11950 0.58330 1.00000 0.00899 O7 0.33700 0.00000 0.29570 1.00000 0.01051