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 = 62.9 GPa using ruby-scale Note: P = 65.3 GPa using MgO-scale _database_code_amcsd 0004721 3.878 3.878 3.878 90 90 90 Fm3m atom x y z Mg 0 0 0 O .5 .5 .5