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the Opal is a mineraloid gel which is deposited at relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, and basalt.In Middle-Earth the white, yellow or red, Yellow-green (catseye), Black Opal (Black Grey to black) and fire opal or Naurond) are known.

References

  • MERP Rulebook 2nd Edition
  • The Gems of Middle-earth, online essay by William E Wilson

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