👉 Autunites are a type of mineral that is formed by the cooling and solidification of magma in the Earth's mantle. They occur in a variety of places, including the North American Plate, Siberia, and the Pacific Ocean. The term "autunite" was coined by Russian geologist Alexei Ivanovich Pirogov in 1920 for a type of mineral that is similar to an autunite but has a slightly different composition. The main component of an aut