data_global _chemical_name_mineral 'Ellingsenite' loop_ _publ_author_name 'Yakovenchuk V N' 'Ivanyuk G Y' 'Pakhomovsky Y A' 'Selivanova E A' 'Mikhailova J A' 'Krivovichev S V' 'Zolotarev A A' 'Zalkind O A' _journal_name_full 'The Canadian Mineralogist' _journal_volume 49 _journal_year 2011 _journal_page_first 1165 _journal_page_last 1173 _publ_section_title ; Ellingsenite, Na5Ca6Si18O38(OH)13*6H2O, a new martinite-related mineral species from phonolite of the Aris alkaline complex, Namibia Note: This is reported as an incomplete structure ; _database_code_amcsd 0018739 _chemical_compound_source 'Ariskop quarry, Aris alkaline complex, Namibia' _chemical_formula_sum 'Na3.62 Ca5.1 Si16 O43.96 H3.92' _cell_length_a 9.576 _cell_length_b 9.577 _cell_length_c 16.438 _cell_angle_alpha 85.85 _cell_angle_beta 75.23 _cell_angle_gamma 60.142 _cell_volume 1261.534 _exptl_crystal_density_diffrn 1.901 _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 Na1 0.50000 0.00000 0.50000 1.00000 0.02100 Na2 0.84480 -0.21280 0.71070 0.86000 0.01700 Ca1 0.35640 -0.29070 -0.50250 1.00000 0.01520 Ca2 0.08180 -0.85820 -0.51300 1.00000 0.01250 Ca3 0.77560 -0.41590 -0.49420 0.55000 0.01800 Na3 0.77560 -0.41590 -0.49420 0.45000 0.01800 Si1 0.45950 -0.44400 -0.23010 1.00000 0.01660 Si2 0.80560 -0.66300 -0.33280 1.00000 0.01250 Si3 0.29870 0.45770 -0.32680 1.00000 0.01390 Si4 0.05010 -0.03240 -0.33090 1.00000 0.01140 Si5 0.92470 -0.41530 -0.32460 1.00000 0.01470 Si6 0.41830 -0.16030 -0.33120 1.00000 0.01280 Si7 0.54530 0.08880 -0.32540 1.00000 0.01350 Si8 0.78990 -0.11000 -0.22250 1.00000 0.01610 O1 0.08500 -0.07780 -0.42720 1.00000 0.01500 O2 0.93000 -0.36500 -0.41820 1.00000 0.03300 O3 0.66400 0.06700 -0.41710 1.00000 0.01900 O4 0.37000 0.47900 -0.42220 1.00000 0.02100 O5 0.81500 -0.66160 -0.42930 1.00000 0.01500 O6 0.78160 -0.19800 -0.56240 1.00000 0.01300 O7 0.39200 0.27100 -0.30220 1.00000 0.02100 O8 0.75700 -0.09100 -0.12370 1.00000 0.04200 O9 0.87000 -0.55000 -0.30300 1.00000 0.02100 O10 0.93200 -0.84100 -0.30920 1.00000 0.01800 O11 0.63800 0.04400 -0.25060 1.00000 0.01800 O12 0.10900 0.49600 -0.30750 1.00000 0.02100 O13 0.49500 -0.23100 -0.42490 1.00000 0.01700 O14 0.30800 -0.43800 -0.25930 1.00000 0.01900 O15 0.96300 -0.12100 -0.26970 1.00000 0.02000 O16 0.62500 -0.60600 -0.27300 1.00000 0.02300 O17 0.45400 -0.01800 -0.31540 1.00000 0.01800 O18 0.21400 -0.07200 -0.30350 1.00000 0.01900 O19 0.48200 -0.29100 -0.26220 1.00000 0.02000 O20 0.80200 -0.27200 -0.25050 1.00000 0.02300 O21 0.42100 -0.44000 -0.13170 1.00000 0.04100 Wat22 0.38500 0.08400 -0.18700 0.25000 0.05000 Wat23 0.91500 -0.22200 -0.85700 0.73000 0.05000