Koroit Opal
Opals from the Koroit mines in Australia. These are the hardest of the Boulder Opal types and often referred to as "Koroit Picture Opals" because of the patterns.
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Koroit Opal
All other stones in the large
image are boulder opals.
see other October birthstones ...
 See also: Jewel, Jewelry, Gemstones, Gold, Stone
  
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