Following is a transcript of the video. Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy.
Artist's reconstruction of Fostoria dhimbangunmal, a newly described iguanodontian dinosaur. James Kuether. Three decades ago, opal miner Bob Foster was getting frustrated while digging around in his ...
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