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The bulk of the world's opal gemstones used for jewelry comes from Coober Pedy Australia:
https://en.wikipedia.org/wiki/Coober_...
Opals are unique:
https://en.wikipedia.org/wiki/Opal
Yanni's Store as well as Museum:
http://www.umoonaopalmine.com.au/
Opal tin endure created past times plants!
http://www.sciencedirect.com/science/...
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