data_global _chemical_name_mineral 'Pigeonite' loop_ _publ_author_name 'Morimoto N' 'Appleman D E' 'Evans H T' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 114 _journal_year 1960 _journal_page_first 120 _journal_page_last 147 _publ_section_title ; The crystal structures of clinoenstatite and pigeonite ; _database_code_amcsd 0010588 _chemical_compound_source 'Asio Mine, Japan' _chemical_formula_sum 'Ca.2 Fe1.12 Mg.68 Si2 O6' _cell_length_a 9.731 _cell_length_b 8.953 _cell_length_c 5.256 _cell_angle_alpha 90 _cell_angle_beta 71.45 _cell_angle_gamma 90 _cell_volume 434.121 _exptl_crystal_density_diffrn 3.661 _symmetry_space_group_name_H-M 'P 1 21/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-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 _atom_site_occupancy _atom_site_U_iso_or_equiv Ca1 0.24600 0.98100 0.23100 0.20000 0.01241 Fe1 0.24600 0.98100 0.23100 0.80000 0.01241 Fe2 0.25100 0.34400 0.23600 0.32000 0.01083 Mg2 0.25100 0.34400 0.23600 0.68000 0.01083 Si1 0.45300 0.66100 0.27400 1.00000 0.00785 Si2 0.04900 0.66200 0.25200 1.00000 0.00969 O1A 0.37200 0.16800 0.31500 1.00000 0.01482 O1B 0.12700 0.16600 0.16100 1.00000 0.00754 O2A 0.37800 0.50600 0.32300 1.00000 0.01121 O2B 0.12500 0.50800 0.14700 1.00000 0.01374 O3A 0.39500 0.77300 0.07000 1.00000 0.00646 O3B 0.10800 0.78200 -0.00600 1.00000 0.00595