The formula for lithium oxide is Li2O. Its molar mass is 29.88 grams per mole. It is a white solid, with a density of 2.013 grams per cubic centimeter, obtained from burning lithium metal in the presence of atmospheric oxygen.
Lithium oxide can be obtained from the thermal decomposition of lithium peroxide, Li2O2, which also produces molecular oxygen. Its melting point is 2,620 degrees Fahrenheit, and its boiling point is 4,710 degrees Fahrenheit. It reacts violently with water to produce lithium hydroxide. It is used in ceramic glazes as a flux, and it reacts with copper and cobalt compounds to produce pigments.