Waste not, want not

Nature Chemistry, Published online: 07 May 2026; doi:10.1038/s41557-026-02140-7 Neodymium is a key element in a wide range of modern technologies, yet its extraction, processing and long-term availability present substantial challenges. Bruce Gibb examines the chemistry and geology of this rare earth element, and considers how its recovery from mine waste could strengthen future supplies.