data_global _chemical_name_mineral 'Sarcopside' loop_ _publ_author_name 'Ericsson T' 'Nord A G' _journal_name_full 'American Mineralogist' _journal_volume 69 _journal_year 1984 _journal_page_first 889 _journal_page_last 895 _publ_section_title ; Strong cation ordering in olivine-related (Ni,Fe)-sarcopsides: a combined Mossbauer, X-ray and neutron diffraction study neutron diffraction ; _database_code_amcsd 0000956 _chemical_compound_source 'Synthetic' _chemical_formula_sum '(Ni.89 Fe2.11) P2 O8' _cell_length_a 10.363 _cell_length_b 4.732 _cell_length_c 5.990 _cell_angle_alpha 90 _cell_angle_beta 90.91 _cell_angle_gamma 90 _cell_volume 293.699 _exptl_crystal_density_diffrn 4.071 _symmetry_space_group_name_H-M 'P 1 21/a 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,z' '1/2-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 _atom_site_U_iso_or_equiv Ni1 0.00000 0.00000 0.50000 0.83000 0.00253 Fe1 0.00000 0.00000 0.50000 0.17000 0.00253 Fe2 0.28200 -0.02300 0.23700 0.97000 0.00253 Ni2 0.28200 -0.02300 0.23700 0.03000 0.00253 P 0.09300 0.41400 0.26600 1.00000 0.00633 O1 0.10700 0.74600 0.27600 1.00000 0.00127 O2 0.46000 0.18800 0.25300 1.00000 0.00127 O3 0.17900 0.31300 0.06400 1.00000 0.00127 O4 0.15800 0.27600 0.46800 1.00000 0.00127