Corporate Overlords are Mining the Sky

[Khendraja'aro]

But how are we defining rare here? They're rare compared to clouds, right?

Rare in the sense that they mostly aren't concentrated like the commonly known metals like iron or copper. Other than that, there's nothing rare about them.

The problem with rare earths is not so much finding them but rather purifying them. That's mostly a not so environmentally-nice process.