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The mineral Aragonite consists of calcium carbonate (CaCO3). It has the same chemical composition as Calcite, it does however have a different crystalline rearrangement. It is formed when water soluble Calcium ions (Ca2+) and carbon dioxide (CO2) react. Aragonite is a less stable form of calcium carbonate and easier to dissolve. The ‘hard’ parts of fossil mollusks (shells) and scleratarians (corals) originally where made up from Aragonite. The aragonite in certain depositions is often replaced by calcite during diagenesis.
There have been periods with either more calcite or more Aragonite depositions depending on conditions and chemical composition of the ocean water and the diversity of species at the time these sediments where deposited.
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