Given humanity would be once able to access any minerals in the asteroid belt and moons of planets, would be there some chemical elements (if stable isotopes exist) still considered as rare?

  • I don't know what you mean by "real" or "once", and I'm not totally sure what you mean by "rare", but the platinum, iridium, and other precious metals in asteroids probably count. – Nathan Tuggy Aug 10 at 10:17
  • A link to the Wikipedia page on Rare Earth Elements was added in an edit, which if relevant would make the answer easy. However, I don't think that it is relevant due to a much more natural connection between the words "rare" and "abundance". Are you asking whether any elements would be classified as "Rare Earth Elements" if a new source becomes available and makes those elements abundant? – Kamil Drakari Aug 10 at 16:31
  • Yes though i.e. wolfram is yet rarer but not classified as such, so question relies to "rare and rarer but (in case) stable isotopes" – J. Doe Aug 10 at 16:41

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