Strontium Oxychloride

By heating a saturated solution of strontium chloride with strontium hydroxide, filtering, and cooling, pearly crystalline plates of composition SrCl₂.SrO.9H₂O are obtained. On drying in vacuo the monohydrate is formed. There are probably also other hydrates with 12, 14, and 15 molecules of water of crystallisation respectively.