data_global _chemical_name_mineral 'Hilairite-(Sr)' loop_ _publ_author_name 'Zubkova N V' 'Kolitsch U' 'Pekov I V' 'Turchkova A G' 'Vigasina M F' 'Pushcharovsky D Y' 'Tillmanns E' _journal_name_full 'European Journal of Mineralogy' _journal_volume 21 _journal_year 2009 _journal_page_first 495 _journal_page_last 506 _publ_section_title ; Crystal chemistry of Rb-, Sr-, Ba-, Ca- and Pb-exchanged forms of natural hilairite Note: sample was synthesized by cation exchange at 150 C ; _database_code_amcsd 0007282 _chemical_compound_source 'Kirovskii mine, Khibiny alkaline complex, Kola Peninsula, Russia' _chemical_formula_sum 'Sr1.015 Zr Si3 O10.65 H3.3' _cell_length_a 20.964 _cell_length_b 20.964 _cell_length_c 7.836 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 2982.451 _exptl_crystal_density_diffrn 2.927 _symmetry_space_group_name_H-M 'R 3' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+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 Sr1a 0.79760 0.65120 0.28090 0.33100 0.04200 Sr1b 0.82290 0.63420 0.15160 0.39300 0.06300 Sr1c 0.86720 0.68940 0.14970 0.29900 0.03450 Sr2 0.34820 0.64550 0.28190 0.33000 0.04100 Zr1 0.00000 0.00000 0.05775 1.00000 0.01550 Zr2 0.50235 0.49769 0.04918 1.00000 0.01750 Si1 0.67110 0.63000 -0.08980 1.00000 0.04820 Si2 0.54010 0.36580 0.18760 1.00000 0.02600 Si3 0.32950 0.45650 0.17860 1.00000 0.04130 Si4 0.38480 0.54320 -0.14840 1.00000 0.01880 O1 0.59870 0.55650 -0.09100 1.00000 0.04500 O2 0.53960 0.58210 0.21500 1.00000 0.03200 O3 0.68260 0.66890 0.10200 1.00000 0.06500 O4 0.61010 0.36290 0.20900 1.00000 0.03900 O5 0.34260 0.51420 0.33960 1.00000 0.06000 O6 0.54960 0.44970 0.19250 1.00000 0.02100 O7 0.48000 0.31120 0.33100 1.00000 0.04300 O8 0.25330 0.38650 0.19300 1.00000 0.04100 O9 0.32540 0.49630 -0.00800 1.00000 0.04400 O10 0.40350 0.44510 0.17400 1.00000 0.02900 O11 0.45920 0.54750 -0.12000 1.00000 0.05600 O12 0.39210 0.62560 -0.15500 1.00000 0.03800 Wat1 0.83200 0.77480 0.22700 0.64000 0.07400 Wat2 0.68720 0.52560 0.24100 0.33000 0.02700 Wat3 0.42200 0.66550 0.17800 0.73000 0.07600 Wat4 0.91500 0.67300 0.16100 0.50000 0.06600