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![PDF] Fossil microbes in opal from Lightning Ridge — implications for the formation of opal | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/6e7a9d5d30343d24a9efb4c15d37602a32c3b10c/4-Figure1-1.png "PDF] Fossil microbes in opal from Lightning Ridge — implications for the formation of opal | Semantic Scholar")
PDF] Fossil microbes in opal from Lightning Ridge — implications for the formation of opal | Semantic Scholar
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