A dump truck unloads raw ore at the  MP Materials Corp. Mountain Pass mine in Mountain Pass, California.Photographer: Joe Buglewicz/BloombergApple Inc. has struck a $500 million deal to buy rare-earth minerals from MP Materials Corp., the US producer that just last week secured backing from the Pentagon. The two companies will build a factory in Texas, with neodymium magnet manufacturing lines tailored for Apple products, the iPhone maker said Tuesday in a statementBloomberg Terminal. Apple said...