data_global _amcsd_formula_title 'SiC-87R' loop_ _publ_author_name 'Ramsdell L S' _journal_name_full 'American Mineralogist' _journal_volume 32 _journal_year 1947 _journal_page_first 64 _journal_page_last 82 _publ_section_title ; Studies on silicon carbide ; _database_code_amcsd 39 _chemical_formula_sum 'Si29 C29' _cell_length_a 3.073 _cell_length_b 3.073 _cell_length_c 218.65 _cell_angle_alpha 90.0 _cell_angle_beta 90.0 _cell_angle_gamma 120.0 _cell_volume 1788.155 _exptl_crystal_density_diffrn 3.239 _symmetry_space_group_name_H-M 'R 3 m' 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' 'x,x-y,z' '2/3+x,1/3+x-y,1/3+z' '1/3+x,2/3+x-y,2/3+z' '-y,-x,z' '2/3-y,1/3-x,1/3+z' '1/3-y,2/3-x,2/3+z' '-x+y,y,z' '2/3-x+y,1/3+y,1/3+z' '1/3-x+y,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 Si 0.0 0.0 0.0 Si 0.0 0.0 0.023 Si 0.0 0.0 0.069 Si 0.0 0.0 0.092 Si 0.0 0.0 0.1379 Si 0.0 0.0 0.1609 Si 0.0 0.0 0.2069 Si 0.0 0.0 0.2299 Si 0.0 0.0 0.2759 Si 0.0 0.0 0.2989 Si 0.0 0.0 0.3448 Si 0.0 0.0 0.3793 Si 0.0 0.0 0.4138 Si 0.0 0.0 0.4483 Si 0.0 0.0 0.4828 Si 0.0 0.0 0.5172 Si 0.0 0.0 0.5517 Si 0.0 0.0 0.5862 Si 0.0 0.0 0.6207 Si 0.0 0.0 0.6552 Si 0.0 0.0 0.7011 Si 0.0 0.0 0.7241 Si 0.0 0.0 0.7701 Si 0.0 0.0 0.7931 Si 0.0 0.0 0.8391 Si 0.0 0.0 0.8621 Si 0.0 0.0 0.908 Si 0.0 0.0 0.931 Si 0.0 0.0 0.977 C 0.0 0.0 0.0086 C 0.0 0.0 0.0316 C 0.0 0.0 0.0776 C 0.0 0.0 0.1006 C 0.0 0.0 0.1465 C 0.0 0.0 0.1695 C 0.0 0.0 0.2155 C 0.0 0.0 0.2385 C 0.0 0.0 0.2845 C 0.0 0.0 0.3075 C 0.0 0.0 0.3534 C 0.0 0.0 0.3879 C 0.0 0.0 0.4224 C 0.0 0.0 0.4569 C 0.0 0.0 0.4914 C 0.0 0.0 0.5258 C 0.0 0.0 0.5603 C 0.0 0.0 0.5948 C 0.0 0.0 0.6293 C 0.0 0.0 0.6638 C 0.0 0.0 0.7097 C 0.0 0.0 0.7327 C 0.0 0.0 0.7787 C 0.0 0.0 0.8017 C 0.0 0.0 0.8477 C 0.0 0.0 0.8707 C 0.0 0.0 0.9166 C 0.0 0.0 0.9396 C 0.0 0.0 0.9856