data_global _chemical_name_mineral 'Vimsite' loop_ _publ_author_name 'Shashkin D P' 'Simonov M A' 'Belov N V' _journal_name_full 'Doklady Akademii Nauk SSSR' _journal_volume 182 _journal_year 1968 _journal_page_first 821 _journal_page_last 824 _publ_section_title ; Crystal structure of a new natural borate vimsite Ca[B2O2(OH)4] ; _database_code_amcsd 0012447 _chemical_formula_sum 'Ca B2 O6 H4' _cell_length_a 10.02 _cell_length_b 9.71 _cell_length_c 4.440 _cell_angle_alpha 90 _cell_angle_beta 92 _cell_angle_gamma 90 _cell_volume 431.723 _exptl_crystal_density_diffrn 2.488 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Ca 0.00000 0.20800 0.25000 0.01165 B 0.20900 0.07000 0.81300 0.01165 O1 0.16500 0.04800 0.11400 0.01165 O-H2 0.35900 0.08400 0.79900 0.01165 O-H3 0.14200 0.20100 0.70500 0.01165