Does the Opal gem occurs only in australia?

Question

Does the Opal gem occurs only in australia?

Answer 1

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Answer 2

No there are many places. The following website gives you some history:

http://www.opalsdownunder.com.au/article...

Answer 3

Almost 95 per cent of all Opals come from Australian mines. The remaining five per cent are mined in Mexico, and in Brazil’s north, also in the US states of Idaho and Nevada, but recently the stones have also been found in Ethiopia and in the West African country of Mali.