Periclase Jacobsen S D, Holl C M, Adams K A, Fischer R A, Martin E S, Bina C R, Lin J F, Prakapenka V B, Kubo A, Dera P American Mineralogist 93 (2008) 1823-1828 Compression of single-crystal magnesium oxide to 118 GPa and a ruby pressure gauge for helium pressure media Note: P = 22.6 GPa using ruby-scale Note: P = 23.0 GPa using MgO-scale _database_code_amcsd 0004706 4.055 4.055 4.055 90 90 90 Fm3m atom x y z Mg 0 0 0 O .5 .5 .5