data_global _chemical_name_mineral 'Tunellite' loop_ _publ_author_name 'Clark J R' _journal_name_full 'American Mineralogist' _journal_volume 49 _journal_year 1964 _journal_page_first 1549 _journal_page_last 1568 _publ_section_title ; The crystal structure of tunellite, SrB6O9(OH)2.3H2O ; _database_code_amcsd 0000129 _chemical_compound_source 'Jenifer mine, Kramer borate district, California, USA' _chemical_formula_sum 'Sr B6 O14 H8' _cell_length_a 14.390 _cell_length_b 8.213 _cell_length_c 9.934 _cell_angle_alpha 90 _cell_angle_beta 114.03 _cell_angle_gamma 90 _cell_volume 1072.299 _exptl_crystal_density_diffrn 2.382 _symmetry_space_group_name_H-M 'P 1 21/a 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,z' '1/2-x,1/2+y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Sr 0.16210 0.05620 0.19490 0.01558 B1 0.19410 0.15090 0.84900 0.01659 B2 0.19400 0.15610 0.58540 0.01115 B3 0.04290 0.24750 0.62480 0.01570 B4 0.18670 0.45500 0.22020 0.00950 B5 0.25340 0.38890 0.48650 0.01608 B6 0.25130 0.38830 0.02210 0.01520 O1 0.19440 0.02540 0.95250 0.02115 O2 0.20280 0.03760 0.48230 0.02318 O-H3 0.05010 0.68060 0.42570 0.02520 Wat4 0.99820 0.16820 0.23830 0.03090 O-H5 0.09050 0.53600 0.17210 0.02660 O6 0.24170 0.79880 0.39890 0.01849 O7 0.20790 0.34130 0.33960 0.01976 O8 0.23820 0.78530 0.08150 0.01938 O9 0.19410 0.34980 0.10110 0.01862 O10 0.08890 0.21170 0.77280 0.01621 O11 0.08710 0.21020 0.53440 0.01558 Wat12 0.02080 0.84010 0.06760 0.02014 Wat13 0.13920 0.58020 0.71170 0.02546 O14 0.22720 0.08280 0.73380 0.01343