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 = 8.0 GPa _database_code_amcsd 0015465 4.625 4.625 5.216 90 90 120 P3_121 atom x y z Biso Si .4488 0 1/3 .51 O .3978 .3052 .2406 .86