Pearl

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A calcareous secretion formed chiefly of calcium carbonate, and found as a morbid deposit around a central nucleus within the shells of various mollusks, especially those of pearl-oysters and river mussels.

Keywords

pearl

Galleries

Clams and Other Bivalves

Source

B. P. Holst The Teachers' and Pupils' Cyclopaedia (Kansas City: The Bufton Book Company, 1909)

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