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These nodules typically range in size from 4–14 cm (1.6–5.5 in) in diameter, though some can be as large as 15 cm (5.9 in). Manganese and related hydroxides precipitate from ocean water or sediment-pore water around a nucleus, which may be a shark's tooth or a quartz grain, forming potato-shaped nodules some 4–14 cm (1.6–5.5 in) in ...