Eggshell

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The intact shell of a white chicken egg.

The term eggshell is a term for the outer covering of a hard-shelled egg, and some forms of eggs with soft outer coats.

The generalized eggshell structure, which varies widely among species, is a protein matrix lined with mineral crystals, usually of a calcium compound such as calcium carbonate. It is calcium build-up and is not made of cells. Harder eggs are more mineralized than softer eggs.

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