data_global _chemical_name_mineral 'Cristobalite' loop_ _publ_author_name 'Dollase W A' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 121 _journal_year 1965 _journal_page_first 369 _journal_page_last 377 _publ_section_title ; Reinvestigation of the structure of low cristobalite ; _database_code_amcsd 0010623 _chemical_compound_source 'Ellora, Hyderabad, India' _chemical_formula_sum 'Si O2' _cell_length_a 4.978 _cell_length_b 4.978 _cell_length_c 6.948 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 172.175 _exptl_crystal_density_diffrn 2.318 _symmetry_space_group_name_H-M 'P 41 21 2' loop_ _space_group_symop_operation_xyz 'x,y,z' 'y,x,-z' '1/2-y,1/2+x,1/4+z' '1/2-x,1/2+y,1/4-z' '-x,-y,1/2+z' '-y,-x,1/2-z' '1/2+y,1/2-x,3/4+z' '1/2+x,1/2-y,3/4-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Si 0.30004 0.30004 0.00000 0.01051 O 0.23976 0.10324 0.17844 0.01963