| The monoclinic octahydrate of Yttrium selenate, Y2(SeO4)3. 8H2O, and the orthorhombic decahydrate, Y2(SeO4)3.10H2O, are known; also the following double sulphates: - Y2(SeO4)3.K2SeO4.6H2O; Y2(SeO4)3.(NH4)2SeO4.6H2O, which are readily soluble in water. |