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only if a turtle counts to 5

Real answer, no they aren't. Shells are made of minerals such as calcium, which molluscs derive from thei environment. The only shells that could be classed as rock aren't really shells at all but fossilised remains of them- fossils being the imprints left behind in sedimentary rocks by prehistoric animals and plants after their real remains have rotted away.

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What type of rock is Limestone made from Shells?

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