What was the chemical you discovered?

Question: What was the chemical you discovered?
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Asked by Gremily to Stuart on 11 Mar 2016. This question was also asked by DR EVIL SPECTACLES.
- Stuart Atkinson answered on 11 Mar 2016:
  
  It was a particular structure of the material Yb2O3. Yb (ytterbium) is one of the rare earths (block 4f of the periodic table).

Question: What was the chemical you discovered?