Monazite is a rare earth phosphate mineral that is commonly used in geological research as a tool for dating geological events. It contains high concentrations of radioactive elements such as thorium and uranium, which decay at known rates, allowing researchers to determine the age of rocks and geological features in which monazite is found. Monazite is particularly useful for dating metamorphic and igneous rocks, as well as determining the timing of tectonic events and mineral deposits. Additionally, monazite can provide valuable insights into the history of Earth's crustal evolution and the formation of mountain ranges.