What’s the rarest rock you’ve found/discovered – Einsteinium Zone

Question: What's the rarest rock you've found/discovered
- Keywords:
  geology,
  rare,
  rock
Asked by anon-191528 to Graeme on 13 Nov 2018.
- Graeme Poole answered on 13 Nov 2018:
  
  I’ve used bits of Moon rock brought back by Neil Armstrong

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