A mysterious type of magma in extinct volcanoes may hold abundant rare earth elements, crucial for clean technologies like electric vehicles and wind turbines, according to a new study. These elements, essential for reducing fossil fuel dependence, are not rare but hard to extract. The study, inspired by a large deposit found in Sweden, suggests iron-rich magma is highly efficient at concentrating rare earths. This discovery could lead to new sources in extinct volcanoes worldwide, potentially benefiting both companies and the environment.