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This sand is from the Big Sur coast of California, with many metamorphic rocks created near an ancient subduction zone. The sand on the right is 100% composed on shells, coral skeleton, and other biological precipitates.
Biogenic sand samples (also called organic or biological sands) are composed of pieces the skeletal remains of plants and animals. They are also sometimes called calcium sands because the chemical composition of most skeletal remains is calcium carbonate (CaCO3), the material our bones are made of.