Gonzolo said:Hard substances are rare in biology. Egg shells feel and crack like ceramics, but it probably has carbon in it.
An eggshell is primarily composed of calcium carbonate, which is a mineral compound. It makes up the outermost layer of an egg and provides protection to the developing embryo inside.
Approximately 94% of an eggshell's composition is calcium carbonate. This mineral gives the eggshell its hardness and strength.
In addition to calcium carbonate, an eggshell contains small amounts of other minerals such as magnesium carbonate and traces of proteins. These components contribute to the shell's structure.
The color of an eggshell can vary depending on the bird species but is often influenced by pigments that are deposited during the shell formation process. For example, in chicken eggs, brown pigment is added, while in some birds, like bluebirds, the pigment biliverdin contributes to blue-green eggshells.
The formation of an eggshell is a complex biological process. It begins in the hen's uterus, where calcium and other minerals are deposited around the egg's membrane. This process gradually builds up the eggshell over about 20 hours.
Calcium carbonate is used because it provides strength and protection to the developing embryo. It forms a hard outer layer that shields the egg from physical damage and helps maintain a stable internal environment.
Yes, crushed eggshells are often used as a calcium supplement for plants and garden soil. They can also be used in composting to add calcium to the compost. Additionally, some people use finely ground eggshells as a dietary calcium source.
No, the composition of eggshells can vary among bird species. Different species may have variations in the types and amounts of minerals and pigments present in their eggshells.