data_global _chemical_name_mineral 'Mountainite' loop_ _publ_author_name 'Zubkova N V' 'Pekov I V' 'Pushcharovsky D Y' 'Chukanov N V' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 224 _journal_year 2009 _journal_page_first 389 _journal_page_last 396 _publ_section_title ; The crystal structure and refined formula of mountainite, KNa2Ca2[Si8O19(OH)]*6H2O ; _database_code_amcsd 0011131 _chemical_compound_source 'Yubileinaya pegmatite, Lovozero alkaline complex, Kola Peninsula, Russia' _chemical_formula_sum 'K Na2 Ca2 Si8 O26 H13' _cell_length_a 13.704 _cell_length_b 6.5760 _cell_length_c 13.751 _cell_angle_alpha 90 _cell_angle_beta 105.752 _cell_angle_gamma 90 _cell_volume 1192.668 _exptl_crystal_density_diffrn 2.281 _symmetry_space_group_name_H-M 'P 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,-y,1/2+z' '-x,y,1/2-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 K 0.00000 0.27580 0.25000 1.00000 0.02920 Na1 0.45000 0.84660 0.58170 0.50000 0.04300 Na2 0.43170 0.70750 0.44120 0.50000 0.03000 Ca 0.01912 0.24440 0.56031 1.00000 0.01290 Si1 0.33509 0.22350 0.64951 1.00000 0.01170 Si2 0.21930 0.46900 0.76350 1.00000 0.01090 Si3 0.20420 0.16380 0.12840 1.00000 0.01180 Si4 0.20960 0.50420 0.98330 1.00000 0.01200 O1 0.79580 0.29400 0.26960 1.00000 0.02200 O2 0.11920 0.34370 0.71390 1.00000 0.01800 O3 0.31960 0.38180 0.73490 1.00000 0.01800 O4 0.90340 0.07680 0.42650 1.00000 0.02250 O5 0.27240 0.29750 0.53830 1.00000 0.02000 O6 0.25430 0.47030 0.88600 1.00000 0.01600 O7 0.74950 0.30640 0.44410 1.00000 0.01700 O8 0.29300 0.00550 0.67340 1.00000 0.02100 O9 0.45340 0.20510 0.65830 0.50000 0.02200 O-H9 0.45340 0.20510 0.65830 0.50000 0.02200 O10 0.09090 0.46340 0.46030 1.00000 0.01800 Wat11 0.90940 0.08370 0.65120 1.00000 0.02300 Wat12 0.50000 0.68500 0.75000 1.00000 0.07500 Wat13 0.47470 0.57300 0.46910 0.50000 0.03800 Wat14 0.36000 0.05000 0.39730 0.50000 0.04200 Wat15 0.54880 0.93800 0.56800 0.50000 0.05500