data_global _chemical_name_mineral 'Cristobalite' loop_ _publ_author_name 'Dove M T' 'Craig M S' 'Keen D A' 'Marshall W G' 'Redfern S A T' 'Trachenko K O' 'Tucker M G' _journal_name_full 'Mineralogical Magazine' _journal_volume 64 _journal_year 2000 _journal_page_first 569 _journal_page_last 576 _publ_section_title ; Crystal structure of the high-pressure monoclinic phase-II of cristobalite, SiO2 Note: P = 3.5 GPa, refinement by unconstrained Rietveld analysis ; _database_code_amcsd 0014541 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Si O2' _cell_length_a 8.3780 _cell_length_b 4.6018 _cell_length_c 9.0568 _cell_angle_alpha 90 _cell_angle_beta 124.949 _cell_angle_gamma 90 _cell_volume 286.205 _exptl_crystal_density_diffrn 2.789 _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_U_iso_or_equiv Si1 0.37260 0.73390 0.21870 -0.00180 Si2 0.13400 0.97790 0.85290 -0.00180 O1 0.18480 0.87450 0.03650 0.00280 O2 0.30560 0.59540 0.33310 0.00280 O3 0.53630 0.97380 0.33150 0.00280 O4 0.93040 0.80520 0.69080 0.00280