If an egg cell were treated with EDTA, a chemical that binds calcium and magnesium ions, the fertilization envelope would not form.
An eggshell is a soft outer coat and a semipermeable membrane that is made up of calcium carbonate (CaCO3).
It is semi-permeable so air and water can not pass through it and the inside material remains intact.
A small shell or outermost coating called 'cuticle or bloom' prevents bacteria and other microorganisms to get inside the egg shell.
Moreover, egg yolk is a rich source of protein and other beneficial organic compounds.
Egg shell are used as chicken feed.
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