Biotite is primarily used in geological and environmental studies as a natural tracer for understanding rock formation and weathering processes. Due to its layered silicate structure and high content of potassium and magnesium, it serves as a valuable indicator mineral in metamorphic petrology to assess the temperature and pressure conditions during rock transformation. In soil science, biotite contributes to the slow release of nutrients such as potassium and trace elements as it weathers, supporting long-term soil fertility. It is also used in radiometric dating, particularly potassium-argon and argon-argon methods, to determine the age of rocks and geological events. Additionally, ground biotite has found use in construction materials and as a filler in paints and plastics due to its stability and flaky texture.