Why MP Materials Stock Plummeted by 8% on Friday

MP Materials (MP -7.92%), the company that owns the sole rare earth mine in this country, didn't have a prosperous Friday on the stock market. Its shares were hit with an 8% decline following the company's publication of its latest quarterly earnings release. That fall was particularly conspicuous, given that the benchmark S&P 500 (^GSPC -0.07%) more or less traded sideways that day.Material shortfallMP Materials' first-quarter figures were disseminated after market hours Thursday, and on Friday it felt as ...