data_global _chemical_name_mineral 'Willemite' loop_ _publ_author_name 'Marumo F' 'Syono Y' _journal_name_full 'Acta Crystallographica, Section B' _journal_volume 27 _journal_year 1971 _journal_page_first 1868 _journal_page_last 1870 _publ_section_title ; The crystal structure of Zn2SiO4-II, a high-pressure phase of willemite ; _database_code_amcsd 0009399 _chemical_formula_sum 'Zn2 Si O4' _cell_length_a 7.0069 _cell_length_b 7.0069 _cell_length_c 6.4637 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 317.346 _exptl_crystal_density_diffrn 4.665 _symmetry_space_group_name_H-M 'I -4 2 d' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' '1/2-y,-x,3/4+z' '-y,1/2-x,1/4+z' 'y,-x,-z' '1/2+y,1/2-x,1/2-z' '-x,1/2+y,1/4-z' '1/2-x,+y,3/4-z' '-x,-y,z' '1/2-x,1/2-y,1/2+z' '1/2+y,x,3/4+z' '+y,1/2+x,1/4+z' '-y,x,-z' '1/2-y,1/2+x,1/2-z' 'x,1/2-y,1/4-z' '1/2+x,-y,3/4-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Zn 0.15700 0.25000 0.12500 Si 0.00000 0.00000 0.50000 O 0.30790 0.48900 0.13760 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Zn 0.00075 0.00199 0.00381 0.00000 0.00000 0.00046 Si 0.00199 0.00199 0.00381 0.00000 0.00000 0.00000 O 0.00846 0.01219 0.01439 -0.00025 -0.00023 -0.00092