| PubChem = 14778 | RTECS = EW3100000 | UNNumber = 1910 }} | Section2 = | Section3 = | Section7 = | Section8 = }} Calcium oxide (CaO), commonly known as burnt lime, lime or quicklime,'s a widely used chemical compound. It's a white, caustic and alkaline crystalline solid at room temperature. As a commercial product, lime often also contains magnesium oxide, silicon oxide and smaller amounts of aluminium oxide and iron oxide. The name lime (native lime) refers to a very rare mineral of the CaO c… (More on Quicklime)