Do some of the rocks that incounter have a color like spilt oil ? – Erbium Zone

Question: Do some of the rocks that incounter have a color like spilt oil ?
- Keywords:
  color,
  oil,
  rocks
Asked by CheeseyFries to Tom on 9 Mar 2015.
- Thomas Barrett answered on 9 Mar 2015:
  
  Yes. We call this iridescent and it is usually because they contain oil 😛

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