There are some mineral specimens in this world that beggar belief and the opal pineapples from White Cliffs in Australia are amongst those. They are palm-sized clusters of radiating points, looking like some bizarre fruit and have been known since the beginning of the 20th century. Found only in the Cretaceous sediments of the White Cliffs opal field in New South Wales, they occurred in an area which has also produced opalised fossils of marine shells, pieces of wood, and even the occasional ...


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