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Which minerals are in shells?

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For the most part, there is only one type of mineral in a shell: polymorphs of calcium carbonate (aka, lime). Mollusc shell. Shells are almost always composed of polymorphs of calcium carbonate - either calcite or aragonite. read more

Unlike seashells, turtle shells have living cells, blood vessels and nerves, including a large number of cells on the calcareous shell surface and scattered throughout its interior. Bone cells that cover the surface and are dispersed throughout the shell secrete protein and mineral and more or less entomb themselves. read more

Some shells are also those of clams, scallops, or oysters. Depending on the location, any of these might be more numerous than the shells of snails. In any case, the process of formation is similar: A soft-bodied mollusk secretes calcium carbonate which accumulates as the shell as the animal grows, then the empty shell remains when the animal dies. read more

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Gastropod Shell, formed by mineral replacement. | precious ...
Source: pinterest.com

Further Research

Sea Shell Minerals
seashellminerals.com

What is Sea Shell Minerals?
seashellminerals.com