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How long does it take for opal to be formed?

Answer:
Current scientific theory states that opals can take thousands, even millions of years, to form. However, an Australian fossicker has proven that, given the right conditions, the process can actually take place over a matter of months. See the related link below.
First answer by On the Wallaby. Last edit by On the Wallaby. Contributor trust: 2765 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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