Ice VI Kamb B Science 150 (1965) 205-209 Structure of ice VI _database_code_amcsd 0015417 6.27 6.27 5.79 90 90 90 P4_2/nmc atom x y z Wat1 0 .276 .382 Wat2 0 0 0 Wat3 .5 .5 .5