data_global _chemical_name_mineral 'Burovaite-Ca' loop_ _publ_author_name 'Azarova Y V' 'Shlyukova Z V' 'Zolotarev A A' 'Organova N I' _journal_name_full 'Geology of Ore Deposits' _journal_volume 51 _journal_year 2009 _journal_page_first 774 _journal_page_last 783 _publ_section_title ; Burovaite-Ca, (Na,K)4Ca2(Ti,Nb)8[Si4O12]4(OH,O)8*12H2O, a new labuntsovite-group mineral species and its place in low-temperature mineral formation in pegmatites of the Khibiny Pluton, Kola Peninsula, Russia ; _database_code_amcsd 0018314 _chemical_compound_source 'Khibiny Pluton, Kola Peninsula, Russia' _chemical_formula_sum 'Si8 (Ti2.88 Nb1.12) O34.44 Ca.88 K1.34 Ba.02 Na1.64 Sr.04 H12.88' _cell_length_a 14.529 _cell_length_b 14.203 _cell_length_c 7.899 _cell_angle_alpha 90 _cell_angle_beta 117.37 _cell_angle_gamma 90 _cell_volume 1447.533 _exptl_crystal_density_diffrn 2.667 _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 0.31420 0.11047 0.23900 1.00000 0.01600 Si2 0.20140 0.11085 0.79370 1.00000 0.01690 TiM1 0.25000 0.25000 0.50000 0.67000 0.02690 NbM1 0.25000 0.25000 0.50000 0.33000 0.02690 TiM2 0.00000 0.23715 0.50000 0.77000 0.02330 NbM2 0.00000 0.23715 0.50000 0.23000 0.02330 O1 0.08090 0.13600 0.67920 1.00000 0.02100 O2 0.27050 0.17020 0.71910 1.00000 0.02730 O3 0.25300 0.13720 0.36680 1.00000 0.02470 O4 0.34340 0.00000 0.26280 1.00000 0.02800 O5 0.21850 0.00000 0.77000 1.00000 0.03300 O6 0.41990 0.16790 0.31030 1.00000 0.02380 O7 0.24000 0.13270 0.01860 1.00000 0.03260 O8 0.10090 0.23750 0.39570 1.00000 0.01960 CaD1 0.00000 0.00000 0.50000 0.64000 0.01990 WatC1 0.10260 0.00000 0.33280 0.64000 0.06400 KC1 0.10260 0.00000 0.33280 0.19000 0.06400 BaC1 0.10260 0.00000 0.33280 0.01000 0.06400 NaA1 0.08260 0.23920 -0.01230 0.41000 0.02170 CaA1 0.08260 0.23920 -0.01230 0.06000 0.02170 SrA1 0.08260 0.23920 -0.01230 0.01000 0.02170 KB1 0.41880 0.00000 0.70350 0.48000 0.11500 Wat2 0.00000 0.38790 0.00000 1.00000 0.20300 Wat3 0.02630 0.37320 0.11700 0.79000 0.17900