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 = 2.0 Gpa _database_code_amcsd 0015463 4.812 4.812 5.327 90 90 120 P3_121 atom x y z Biso Si .4646 0 1/3 .51 O .4093 .2778 .2264 .86