SiO2 Kuwayama Y, Hirose K, Sata N, Ohishi Y Science 309 (2005) 923-925 The pyrite-type high-pressure form of silica Sample: P = 271 GPa, T = 300 K _database_code_amcsd 0015438 3.9299 3.9299 3.9299 90 90 90 Pa3 atom x y z Biso Si 0 0 0 .37 O .3484 .3484 .3484 1.48