Crystal growth in living bodies

Crystals (or amorphous substances) are also formed in living bodies as a result of biological activities to act as a reservoir for necessary components (for example, amorphous silica in grass cells, and calcium oxalate or inuline crystals in dahlias and begonias), or crystals are formed by excretion processes or due to illness (for 

Aragonite corals, moUusks, gastropods, cephalopods, fish 

Amorphous CnCO crustaceans, birds eggs, plants 

Hydroxyapatite vertebrates, mammals, fish Octacalcium phosphate vertebrates Amorphous SiO limpets, chitons Magnetite chitons Goethite fimpets Phosphoferrite chitons 

Magnetite magnetotactic bacteria, tuna, salmon, pigeons Calcite mammals, fish Gypsum j ellyfish Barite chart 

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There is no essential difference between crystal growth in living bodies and that... 

Spiral form, growth, and movement are very common in nature, so much so that I have regarded spirality as a property common to all living matter (80). The movement of protozoa and men (73), the growth of trees (80), molluscs, and body parts such as horns and tusks, and the shape of chromosomes (41), are spiral. To what extent spirality in animate nature is to be attributed to the asymmetry of crystals, the asymmetry of the carbon atom, or helical organic molecules is a matter of conjecture, but the spirality itself cannot be doubted. 

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