US, Ukraine may sign deal on rare-earth materials on Feb. 22 -- WSJ - What to know about Ukraine's controversial rare earth minerals - What are rare earth elements, and why does Trump want them from Ukraine? - After 100 years of harvesting coal, SCCL set to mine rare earths, focus on green energy - Alta Resource breaks down e-waste for rare earth metals that electronics need - Enormous cache of rare earth elements hidden inside coal ash waste, study suggests - Extinct volcanoes a 'rich' source of rare earth elements, research suggests - China says rare earths belong to state in new regulation - Secrets of radioactive 'promethium' -- a rare earth element with mysterious applications -- uncovered after 80-year search - Promethium bound: New study uncovers rare earth element's properties