Montroydite Aurivillius K Acta Chemica Scandinavica 18 (1964) 1305-1306 Least-squares refinement of the crystal structures of orthorhombic HgO and of Hg2O2NaI Locality: synthetic _database_code_amcsd 0011897 6.6129 5.5208 3.5219 90 90 90 Pnma atom x y z Biso Hg .1136 .25 .2456 1.20 O .3592 .25 .5955 1.47