Ice VII Kamb B, Davis B L Proceedings of the National Academy of Sciences 52 (1964) 1433-1439 Ice VII, the densest form of ice Note: T = 223 K, P = 2.5 GPa Locality: synthetic _database_code_amcsd 0018369 3.30 3.30 3.30 90 90 90 Pn3m atom x y z occ O 0 0 0 H .17 .17 .17 .5