MP Materials, which runs the only American rare earths mine , announced a new $500 million agreement with tech giant Apple on Tuesday to produce more of the powerful magnets used in iPhones as well as other high-tech products like electric vehicles. This news comes on the heels of last week’s announcement that the U.S. Defense Department agreed to invest $400 million in shares of the Las Vegas-based company. That will make the government the largest shareholder in MP Materials and help increase