Autunite is a bright yellow-green mineral that is a source of uranium. It is a member of the phosphate mineral group and is primarily composed of uranium, calcium, phosphate, and water. Autunite typically forms in oxidized zones of uranium deposits and can be found in various locations around the world, including parts of France and Germany. This mineral is known for its distinctive color and can fluoresce under ultraviolet light. Autunite is often studied for its radioactive properties and is used in geological and environmental research related to nuclear energy and radioactive waste. However, due to its radioactivity, it must be handled with care.