Uncommon. But, exist in massive amounts, relative to need. So, will not be a functional limit to growth because their name, is not their availability: That's go

Uncommon. But, exist in massive amounts, relative to need. So, will not be a functional limit to growth because their name, is not their availability: That's governed by investment in mining, and the cost of refinement and purification of the source. We got lazy. It's cheaper to source them from China. When people stand up proposals to open or re-open the mines in Australia, Canada, Africa, the price becomes the deciding factor, not their strategic worth. Are they as common as Iron Ore? No. Are they as rare as hen's teeth? No. It's like "the World Series" -The Name doesn't mean what people think it means: it's just the name