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: A5 ; _database_code_amcsd 0001659 _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 9.779 _cell_length_b 17.888 _cell_length_c 5.287 _cell_angle_alpha 90 _cell_angle_beta 103.85 _cell_angle_gamma 90 _cell_volume 897.949 _exptl_crystal_density_diffrn 3.105 _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 0.28020 0.08570 0.29320 0.99000 0.00507 Al1 0.28020 0.08570 0.29320 0.01000 0.00507 Si2 0.28840 0.17130 0.80160 0.99000 0.00532 Al2 0.28840 0.17130 0.80160 0.01000 0.00532 Mg1 0.00000 0.08770 0.50000 0.93000 0.00709 Al1 0.00000 0.08770 0.50000 0.04000 0.00709 Fe1 0.00000 0.08770 0.50000 0.02700 0.00709 Mn1 0.00000 0.08770 0.50000 0.00300 0.00709 Mg2 0.00000 0.18070 0.00000 0.36000 0.00595 Ti2 0.00000 0.18070 0.00000 0.02000 0.00595 Fe2 0.00000 0.18070 0.00000 0.56000 0.00595 Mn2 0.00000 0.18070 0.00000 0.06000 0.00595 Li3 0.00000 0.00000 0.00000 0.24000 0.00697 Mg3 0.00000 0.00000 0.00000 0.76000 0.00697 Na4 0.00000 0.27640 0.50000 0.95000 0.01355 Ca4 0.00000 0.27640 0.50000 0.05000 0.01355 NaA 0.00000 0.50000 0.00000 0.11000 0.05522 KA 0.00000 0.50000 0.00000 0.04000 0.05522 NaAm 0.04790 0.50000 0.10140 0.11000 0.03559 KAm 0.04790 0.50000 0.10140 0.04000 0.03559 NaA2 0.00000 0.46540 0.00000 0.11000 0.04876 KA2 0.00000 0.46540 0.00000 0.04000 0.04876 H 0.17390 0.00000 0.74370 1.00000 0.02001 O1 0.11110 0.08820 0.21420 1.00000 0.00697 O2 0.11820 0.16930 0.73180 1.00000 0.00760 O-h3 0.10910 0.00000 0.70750 0.79000 0.00975 F3 0.10910 0.00000 0.70750 0.21000 0.00975 O4 0.36270 0.25030 0.79960 1.00000 0.00975 O5 0.34920 0.12940 0.08490 1.00000 0.00937 O6 0.34260 0.11930 0.58360 1.00000 0.00912 O7 0.33690 0.00000 0.29560 1.00000 0.01077