data_global _chemical_name_mineral 'Phase H' loop_ _publ_author_name 'Bindi L' 'Nishi M' 'Tsuchiya J' 'Irifune T' _journal_name_full 'American Mineralogist' _journal_volume 99 _journal_year 2014 _journal_page_first 1802 _journal_page_last 1805 _publ_section_title ; Crystal chemistry of dense hydrous magnesium silicates: The structure of phase H, MgSiH2O4, synthesized at 45 GPa and 1000 C ; _database_code_amcsd 0020313 _chemical_compound_source 'Synthetic' _chemical_formula_sum '(Mg.5 Si.5) O2 H' _cell_length_a 4.733 _cell_length_b 4.3250 _cell_length_c 2.8420 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 58.176 _exptl_crystal_density_diffrn 3.380 _symmetry_space_group_name_H-M 'P n n m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-z' 'x,y,-z' '-x,-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 Mg 0.00000 0.00000 0.00000 0.50000 0.01270 Si 0.00000 0.00000 0.00000 0.50000 0.01270 O 0.34730 0.23030 0.00000 1.00000 0.01780 H 0.47500 0.04200 0.00000 0.50000 ?