Arsenic Schiferl D, Barrett CS Journal of Applied Crystallography 2 (1969) 30-36 The crystal structure of arsenic at 4.2, 78 and 299 K Sample: T = 4.2 K _database_code_amcsd 0012833 3.7597 3.7597 10.4412 90 90 120 R-3m atom x y z Biso As 0 0 .22764 .229