Calcium Oxide

**Trivial name:** Quicklime

**Formula:** CaO

**Molar mass:** 56,077 g/mol

**Mohs scale hardness:** 1,75

**Crystal system:** cubic system

**Cell:** Two face-centred cubic cells

**Information:** It is a white caustic and alkaline solid crystalline.

**Use:** Calcium oxide is a widespread commonly used chemical compound. As hydrated in the form of slaked lime, i.e. calcium hydroxide Ca(OH)₂ it is used as part of mortar and gypsum to increase the hardness of the material.