data_global _chemical_name_mineral 'Larnite' loop_ _publ_author_name 'Tsurumi T' 'Hirano Y' 'Kato H' 'Kamiya T' 'Daimon M' _journal_name_full 'Ceramic Transactions' _journal_volume 40 _journal_year 1994 _journal_page_first 19 _journal_page_last 25 _publ_section_title ; Crystal structure and hydration of belite ; _database_code_amcsd 0012181 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Ca2 Si O4' _cell_length_a 5.5075 _cell_length_b 6.7509 _cell_length_c 9.3055 _cell_angle_alpha 90 _cell_angle_beta 94.597 _cell_angle_gamma 90 _cell_volume 344.871 _exptl_crystal_density_diffrn 3.317 _symmetry_space_group_name_H-M 'P 1 21/n 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Ca1 0.22700 0.34200 0.43000 Ca2 0.22000 -0.00200 -0.29800 Si 0.26700 -0.21800 0.41800 O1 0.21700 0.00900 0.44000 O2 0.02000 -0.33100 0.36400 O3 0.47600 -0.25200 0.31000 O4 0.34300 -0.32900 -0.42900