data_global _chemical_name_mineral 'Aenigmatite' loop_ _publ_author_name 'Yang H' 'Konzett J' _journal_name_full 'American Mineralogist' _journal_volume 85 _journal_year 2000 _journal_page_first 259 _journal_page_last 262 _publ_section_title ; High-pressure synthesis of Na2Mg6Si6O18(OH)2 - a new hydrous silicate phase isostructural with aenigmatite ; _database_code_amcsd 0002350 _chemical_formula_sum 'Mg5.92 Al.08 Na2 Si6 H2 O20' _cell_length_a 10.2925 _cell_length_b 10.7052 _cell_length_c 8.8027 _cell_angle_alpha 105.280 _cell_angle_beta 96.712 _cell_angle_gamma 125.256 _cell_volume 718.083 _exptl_crystal_density_diffrn 3.157 _symmetry_space_group_name_H-M 'P -1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-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 MgM1 0.00000 0.00000 0.50000 1.00000 0.01300 MgM2 0.00000 0.50000 0.00000 1.00000 0.01740 MgM3 0.31390 0.84980 0.17820 1.00000 0.00950 MgM4 0.76870 0.81950 0.15120 1.00000 0.00860 MgM5 0.59490 0.94070 0.06170 1.00000 0.00850 MgM6 0.09660 0.94200 0.05340 1.00000 0.01350 MgM7 0.99000 0.73090 0.26800 0.92000 0.00780 AlM7 0.99000 0.73090 0.26800 0.08000 0.00780 NaM8 0.20880 0.63340 0.38990 1.00000 0.01510 NaM9 0.66200 0.60990 0.36720 1.00000 0.01550 SiT1 0.47650 0.23330 0.33350 1.00000 0.00840 SiT2 0.98040 0.22990 0.34280 1.00000 0.00860 SiT3 0.78800 0.33850 0.23750 1.00000 0.00600 SiT4 0.27800 0.33980 0.22430 1.00000 0.00600 SiT5 0.64780 0.94950 0.44280 1.00000 0.00780 SiT6 0.35630 0.55960 0.04550 1.00000 0.00790 H1 0.12900 0.04860 0.34220 1.00000 ? H2 0.02410 0.33810 0.04890 1.00000 ? O1 0.35160 0.06760 0.16880 1.00000 0.01080 O2 0.85170 0.06270 0.17450 1.00000 0.01090 O3 0.55770 0.96050 0.29310 1.00000 0.01040 O-h4 0.02670 0.94560 0.27350 1.00000 0.01950 O5 0.23980 0.87480 0.38580 1.00000 0.01370 O6 0.75370 0.88560 0.38650 1.00000 0.01320 O7 0.50470 0.80150 0.49920 1.00000 0.00910 O8 0.95650 0.78350 0.49000 1.00000 0.01050 O9 0.89140 0.31520 0.37280 1.00000 0.01100 O10 0.39920 0.33230 0.35630 1.00000 0.00750 O11 0.65780 0.16530 0.06550 1.00000 0.00730 O12 0.15600 0.16410 0.05850 1.00000 0.00680 O-h13 0.53180 0.71630 0.03780 1.00000 0.00980 O14 0.06170 0.73230 0.06030 1.00000 0.00970 O15 0.24260 0.60910 0.11000 1.00000 0.00660 O16 0.74840 0.60840 0.12600 1.00000 0.00820 O17 0.40320 0.50360 0.19070 1.00000 0.01040 O18 0.93350 0.50480 0.21960 1.00000 0.01150 O19 0.15940 0.36450 0.31500 1.00000 0.01230 O20 0.67050 0.36370 0.33670 1.00000 0.00660