Caesium chloride or cesium chloride is the inorganic compound with the formula CsCl. This colorless salt is an important source of caesium ions in a variety of niche applications. Its crystal structure forms a major structural type where each caesium ion is coordinated by 8 chloride ions. Wikipedia Formula: CsCl IUPAC ID: Caesium chloride Molar mass: 168.36 g/mol Soluble in: Water Melting point: 645 °C Density: 3.99 g/cm³ Boiling point: 1,297 °C