In what form are minerals present in living organisms?

Most of the cell’s minerals are in the form of salts dissociated into ions, or in a solid state.
In the cytoplasm of almost any cell there are crystalline inclusions, consisting, as a rule, of poorly soluble salts of calcium and phosphorus. In addition to them, silicon dioxide and other inorganic substances may be contained. They are used to form the supporting structures of the cell (for example, the mineral skeleton of radiolarians) and the body – the mineral substance of bone tissue (calcium and phosphorus salts), mollusk shells (calcium salts), chitin (calcium salts), etc.

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