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Calcite- Aragonite - Limestone - Formed from volcanic ash and sea-life - 50-70 million years old. Origin: Began as muddy sediment on ancient seabeds around the Cretaceous period.Cracking: As prehistoric waters receded, the mud balls dried out and shrank, creating internal fractures.Mineral Filling: Groundwater seeped through, leaving behind crystal deposits of calcite and aragonite inside the empty spaces