Before you trash your eggshells from this morning’s breakfast, check out different ways to reuse them in your garden and home. What’s With the Eggshells? Eggshells are primarily composed of calcium carbonate (about 94%) and small amounts of protein, magnesium, and other minerals. The eggshell is formed by the deposition of calcium carbonate crystals around the yolk and white of the egg, creating a hard, … Continue reading Don’t Trash Your Eggshells