data_global _chemical_name_mineral 'Epidote' loop_ _publ_author_name 'Ito T' _journal_name_full 'American Mineralogist' _journal_volume 32 _journal_year 1947 _journal_page_first 309 _journal_page_last 321 _publ_section_title ; The structure of epidote (HCa2(Al,Fe)Al2Si3O13) ; _database_code_amcsd 41 _chemical_formula_sum 'Ca2 Al2 Fe Si3 O13 H' _cell_length_a 8.96 _cell_length_b 5.63 _cell_length_c 10.2 _cell_angle_alpha 90.0 _cell_angle_beta 115.4 _cell_angle_gamma 90.0 _cell_volume 464.799 _exptl_crystal_density_diffrn 3.453 _symmetry_space_group_name_H-M 'P 1 21/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Ca1 0.963 0.25 0.641 1.0 Ca2 0.963 0.75 0.641 1.0 Al 0.789 0.25 0.814 1.0 Fe 0.0 0.0 0.0 1.0 Si1 0.394 0.25 0.711 0.75 Al1 0.394 0.25 0.711 0.25 Si2 0.604 0.75 0.695 0.75 Al2 0.604 0.75 0.695 0.25 Si3 0.582 0.25 0.553 0.75 Al3 0.582 0.25 0.553 0.25 Si4 0.375 0.75 0.94 0.75 Al4 0.375 0.75 0.94 0.25 O1 0.042 0.0 0.843 1.0 O2 0.301 0.0 0.742 1.0 O3 0.783 0.0 0.694 1.0 O4 0.535 0.25 0.821 1.0 O5 0.535 0.75 0.821 1.0 O6 0.42 0.25 0.582 1.0 O7 0.42 0.75 0.582 1.0 O8 0.0 0.0 0.5 1.0 O9 0.179 0.75 0.033 1.0 O-H10 0.179 0.25 0.033 1.0