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What materials are fossils made of?

Fossilization can occur using literally any mineral that is water soluble, which nearly all of them are. The problem you are running into is "fossil" covers a huge range of things, from ...
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What is the difference between permineralization and replacement

Simply put permineralization is dissolved minerals filling in the existing pore space in fossilized material. Replacement is dissolved minerals replacing the existing minerals (calcium phosphate, ...
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