data_global _amcsd_formula_title 'SiC-51R' 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 38 _chemical_formula_sum 'Si17 C17' _cell_length_a 3.073 _cell_length_b 3.073 _cell_length_c 128.17 _cell_angle_alpha 90.0 _cell_angle_beta 90.0 _cell_angle_gamma 120.0 _cell_volume 1048.195 _exptl_crystal_density_diffrn 3.24 _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 0.039 Si 0.0 0.0 0.118 Si 0.0 0.0 0.157 Si 0.0 0.0 0.235 Si 0.0 0.0 0.275 Si 0.0 0.0 0.353 Si 0.0 0.0 0.412 Si 0.0 0.0 0.471 Si 0.0 0.0 0.529 Si 0.0 0.0 0.588 Si 0.0 0.0 0.647 Si 0.0 0.0 0.725 Si 0.0 0.0 0.765 Si 0.0 0.0 0.843 Si 0.0 0.0 0.882 Si 0.0 0.0 0.961 C 0.0 0.0 0.015 C 0.0 0.0 0.054 C 0.0 0.0 0.132 C 0.0 0.0 0.172 C 0.0 0.0 0.25 C 0.0 0.0 0.289 C 0.0 0.0 0.368 C 0.0 0.0 0.426 C 0.0 0.0 0.485 C 0.0 0.0 0.544 C 0.0 0.0 0.603 C 0.0 0.0 0.662 C 0.0 0.0 0.74 C 0.0 0.0 0.779 C 0.0 0.0 0.858 C 0.0 0.0 0.897 C 0.0 0.0 0.975