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Bivalve molluscs Teredo teredo and Macoma birmanica secrete CaCO 3 in the form of calcite and aragonite respectively, in the mud flats of Hugli estuary and their magnesium contents in the skeletal carbonate were 4.07% (0.168 mole%) for calcite and 0.17% (0.007 mole%) for aragonite. The stoichiometric solubility products (pK *sp ) of biogenous calcite and aragonite in estuarine...
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