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Limestone is principally CaCO3, which is a compound. Because naturally occurring limestone is usually formed from sea shells and ocean bottom debris mixed together, naturally occurring limestone is usually a mixture. Naturally occurring limestone in caves in the form of stalactites and stalagmites can be much more nearly pure than limestone formed from former sea beds, but even these kinds of cave limestone generally contain some materials other than pure CaCO3.

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13y ago

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