Quartz Hazen R M, Finger L W, Hemley R J, Mao H K Solid State Communications 72 (1989) 507-511 High-pressure crystal chemistry and amorphization of alpha-quartz Locality: synthetic Sample: P = 12.5 GPa _database_code_amcsd 0015467 4.535 4.535 5.170 90 90 120 P3_121 atom x y z Biso Si .4487 0 1/3 .51 O .3670 .2952 .2427 .86