As Reader's Digest explains, the prominent ingredient in Tums is calcium carbonate, also found in chalk. The calcium carbonate within Tums gives the brand's tablets its trademark chalky texture.

Sidewalk chalk is made from calcium and sulfate, which makes calcium sulfate. One of the most common chemicals connected to calcium is called “carbonate”, and together they make calcium carbonate.

Workers make the dough for the chalk from about five kinds of materials, including calcium carbonate, based on the method established by Watanabe. Among the machines used to produce the chalk was ...

Eggshells consist almost entirely of calcium carbonate—similar to seashells, chalk, and coral. While it can take time, the calcium from eggshells can be worked into the soil to increase its ...

Ed. Calcium carbonate (CaCO 3) is a natural product found in many settings, including the minerals aragonite 1 and calcite 2; the sedimentary rocks limestone 3 and chalk 4; and animal structures such ...