Coral sand

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Coral sand is a form of aragonite sand particles originating in tropical and sub-tropical marine environments primarily from bioerosion of limestone skeletal material of marine organisms. Often, this is due to corallivores, such as parrotfish, which excrete sand after digestion.^[1] However, the term "coral" in coral sand is used loosely in this sense to mean limestone of recent biological origin; corals are not the dominant contributors of sand particles to most such deposits. Rather, coral sand is a mix of coral and/or remnant skeletal fragments of foraminifera,^[2] calcareous algae, molluscs, and crustaceans . Because it is composed of limestone, coral sand is acid-soluble.