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The Wikipedia page has an image of a great piece of opal from Coober Pedy, South Australia. I bought the opal from a miner about 10 years ago but after grinding it a little, I decided to put it aside for when I was better a making cabochons out of opal.
Today, I found the opal along with another that I saved back then and I proceeded to cut and polish them The cabochons produced are sensational, particularly the one of "the Wikipedia Opal."