Everyone knows Big Tech is booming, but what about the minerals it depends on? The rare earths industry is taking off, and investors are noticing. The stocks of companies like Arafura Rare Earths, Lynas Rare Earths and MP Materials, which mine and refine the metals that help power everything from smartphones to wind turbines, have all more than doubled this year (with some climbing well beyond that), and ETFs investing in the companies have garnered massive inflows. (VanEck’s Rare Earth and Strategic Meta ...