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Minerals, Volume 13, Issue 12
December 2023 - 96 articles
Cover Story: At Lightning Ridge, Australia, fine clay buried Cretaceous plant and animal remains, producing morphologically detailed cavities that later became sites for the precipitation of amorphous opal. Opalization occurred after the dissolution of cellulose and lignin in plants, calcium carbonate in mollusk shells, and calcium phosphate in bones. The times required for these decompositions are variable and depend on geochemical and sedimentologic conditions, but worldwide evidence reveals that the onset of subsequent mineralization may be greatly delayed. Our study of opalized fossils at Lightning Ridge provides a spectacular example: mid-Cretaceous (Cenomanian) sediments contain opalized fossils that were produced by Neogene silica precipitation. View this paper
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Minerals - ISSN 2075-163X