data_global _chemical_name_mineral 'Spencerite' loop_ _publ_author_name 'Fanfani L' 'Nunzi A' 'Zanazzi P F' _journal_name_full 'Mineralogical Magazine' _journal_volume 38 _journal_year 1972 _journal_page_first 687 _journal_page_last 692 _publ_section_title ; Structure and twinning in spencerite ; _database_code_amcsd 0014456 _chemical_compound_source 'Salmo, British Columbia, Canada' _chemical_formula_sum 'Zn4 P2 O13 H8' _cell_length_a 10.448 _cell_length_b 5.282 _cell_length_c 11.208 _cell_angle_alpha 90 _cell_angle_beta 116.73 _cell_angle_gamma 90 _cell_volume 552.430 _exptl_crystal_density_diffrn 3.244 _symmetry_space_group_name_H-M 'P 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,-y,1/2+z' '-x,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_U_iso_or_equiv Zn1 0.00000 0.00000 0.00000 0.02216 Zn2 0.00000 0.02260 0.25000 0.01849 Zn3 0.28630 0.70280 0.49060 0.01634 P 0.17120 0.50970 0.19360 0.00203 O1 0.07750 0.26800 0.15660 0.00874 O2 0.07460 0.74690 0.16410 0.01267 O3 0.28050 0.50270 0.33750 0.01621 O4 0.25380 0.52570 0.11110 0.01127 O-H 0.16910 0.00270 0.44140 0.01406 Wat1 0.49670 0.78730 0.58730 0.01798 Wat2 0.50000 0.81530 0.25000 0.00887