Monazite is a reddish-brown phosphate mineral containing rare earth metals. It occurs usually in small isolated crystals. Lanthanum is the most common rare earth element in monazite. So, statement 1 is correct. Monazite is radioactive due to the presence of thorium and, less commonly, uranium. Because of its radioactive nature, monazite is a useful for radiometric dating of geological events, such as crystallization, heating, or deformation of the rocks containing monazite. So, statement 2 is also correct. Thorium extracted from Monazite sands can be used for generation of nuclear power.