data_global _chemical_name_mineral 'Svyatoslavite' loop_ _publ_author_name 'Takeuchi Y' 'Haga N' 'Ito J' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 137 _journal_year 1973 _journal_page_first 380 _journal_page_last 398 _publ_section_title ; The crystal structure of monoclinic CaAl2Si2O8: a case of monoclinic structure closely simulating orthorhombic symmetry ; _database_code_amcsd 0019486 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Ca.484 Si Al O4' _cell_length_a 8.228 _cell_length_b 8.621 _cell_length_c 4.827 _cell_angle_alpha 90 _cell_angle_beta 90.00 _cell_angle_gamma 90 _cell_volume 342.396 _exptl_crystal_density_diffrn 2.686 _symmetry_space_group_name_H-M 'P 1 21 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-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 Ca1 0.74700 0.47380 0.86420 0.40300 0.00608 Ca2 0.24980 0.00000 0.34400 0.56400 0.01798 SiT1 0.95030 0.14980 0.89450 1.00000 0.00317 AlT2 0.06500 0.33600 0.39760 1.00000 0.00887 SiT3 0.44540 0.32760 0.39520 1.00000 0.00570 AlT4 0.56760 0.13730 0.89410 1.00000 0.00785 O1 0.06090 0.18190 0.17370 1.00000 0.01330 O2 0.03800 0.00210 0.73810 1.00000 0.01115 O3 0.76140 0.13780 0.00210 1.00000 0.01862 O4 0.95400 0.29740 0.68630 1.00000 0.00633 O5 0.56190 0.29300 0.66040 1.00000 0.00760 O6 0.52540 0.48070 0.24860 1.00000 0.01646 O7 0.26640 0.37140 0.47890 1.00000 0.01026 O8 0.44080 0.17620 0.18950 1.00000 0.01406