Eggshell.html |
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An eggshell is the outer covering of a hard-shelled egg term and of 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.
In popular culture
The term "walking on eggshells" refers to acting cautiously.