Initial language selection is based on your web browser preferences.
**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.