data_global _chemical_name_mineral 'Eckermannite' loop_ _publ_author_name 'Oberti R' 'Boiocchi M' 'Hawthorne F C' 'Ball N A' 'Harlow G E' _journal_name_full 'American Mineralogist' _journal_volume 100 _journal_year 2015 _journal_page_first 909 _journal_page_last 914 _publ_section_title ; Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar-crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite Note: Sample AMNH H108401 ; _database_code_amcsd 0020422 _chemical_compound_source 'Jade Mine Tract, Kachin Province, Myanmar' _chemical_formula_sum 'Na2.829 Ca.11 K.067 Mg3.884 Fe.486 Al.62 Mn.01 Si8 O23.97 F.03 H1.97' _cell_length_a 9.8087 _cell_length_b 17.8448 _cell_length_c 5.2905 _cell_angle_alpha 90 _cell_angle_beta 103.6600 _cell_angle_gamma 90 _cell_volume 899.826 _exptl_crystal_density_diffrn 3.032 _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 Na1 0.00000 0.27541 0.50000 0.94500 0.01920 Ca1 0.00000 0.27541 0.50000 0.05500 0.01920 Na2 0.00000 0.50000 0.00000 0.28900 0.02070 K2 0.00000 0.50000 0.00000 0.02100 0.02070 Na3 0.02590 0.50000 0.07170 0.11800 0.03810 K3 0.02590 0.50000 0.07170 0.00900 0.03810 Na4 0.00000 0.47330 0.00000 0.20700 0.03920 K4 0.00000 0.47330 0.00000 0.01400 0.03920 Mg1 0.00000 0.09002 0.50000 0.95000 0.01020 Fe1 0.00000 0.09002 0.50000 0.05000 0.01020 Mg2 0.00000 0.18130 0.00000 0.51200 0.01030 Al1 0.00000 0.18130 0.00000 0.31000 0.01030 Fe2 0.00000 0.18130 0.00000 0.17800 0.01030 Mg3 0.00000 0.00000 0.00000 0.96000 0.00980 Fe3 0.00000 0.00000 0.00000 0.03000 0.00980 Mn3 0.00000 0.00000 0.00000 0.01000 0.00980 Si1 0.27930 0.08630 0.29240 1.00000 0.00850 Si2 0.28706 0.17250 0.80083 1.00000 0.00930 O1 0.11100 0.08805 0.21287 1.00000 0.01080 O2 0.11802 0.16990 0.73412 1.00000 0.01180 O3 0.10828 0.00000 0.70978 0.98500 0.01340 F3 0.10828 0.00000 0.70978 0.01500 0.01340 O4 0.36274 0.25079 0.79757 1.00000 0.01470 O5 0.34970 0.12893 0.08338 1.00000 0.01300 O6 0.34156 0.11827 0.58486 1.00000 0.01380 O7 0.33725 0.00000 0.28952 1.00000 0.01460 H1 0.20360 0.00000 0.74040 0.98500 0.01300 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 Na1 0.02110 0.01710 0.02170 0.00000 0.00990 0.00000 Ca1 0.02110 0.01710 0.02170 0.00000 0.00990 0.00000 Na2 0.00980 0.03000 0.02760 0.00000 0.01500 0.00000 K2 0.00980 0.03000 0.02760 0.00000 0.01500 0.00000 Na3 0.03700 0.04160 0.03280 0.00000 0.00260 0.00000 K3 0.03700 0.04160 0.03280 0.00000 0.00260 0.00000 Na4 0.03940 0.01390 0.07690 0.00000 0.03800 0.00000 K4 0.03940 0.01390 0.07690 0.00000 0.03800 0.00000 Mg1 0.01070 0.01080 0.00880 0.00000 0.00190 0.00000 Fe1 0.01070 0.01080 0.00880 0.00000 0.00190 0.00000 Mg2 0.00970 0.01130 0.00960 0.00000 0.00180 0.00000 Al1 0.00970 0.01130 0.00960 0.00000 0.00180 0.00000 Fe2 0.00970 0.01130 0.00960 0.00000 0.00180 0.00000 Mg3 0.01100 0.00980 0.00780 0.00000 0.00100 0.00000 Fe3 0.01100 0.00980 0.00780 0.00000 0.00100 0.00000 Mn3 0.01100 0.00980 0.00780 0.00000 0.00100 0.00000 Si1 0.00830 0.00940 0.00740 -0.00030 0.00090 -0.00020 Si2 0.00980 0.00980 0.00800 -0.00110 0.00160 0.00010 O1 0.00890 0.01320 0.01020 -0.00130 0.00220 -0.00190 O2 0.01100 0.01180 0.01100 0.00000 -0.00100 -0.00050 O3 0.01160 0.01440 0.01350 0.00000 0.00170 0.00000 F3 0.01160 0.01440 0.01350 0.00000 0.00170 0.00000 O4 0.01970 0.01130 0.01370 -0.00410 0.00520 0.00020 O5 0.00970 0.01810 0.01050 -0.00060 0.00080 0.00380 O6 0.01250 0.01820 0.00980 0.00030 0.00090 -0.00340 O7 0.01380 0.01060 0.01900 0.00000 0.00320 0.00000