is chalk calcium
Quick Answer. Natural chalk is a common form of calcium carbonate. Unlike other, chemically similar minerals, chalk deposits are laid down by living organisms known as coccolithophores. These microscopic animals thrive in the warm, shallow seas that proliferated in the Cretaceous Period, which derives its name from the Latin word for chalk.
chalk is the calcium based shell of ancient single cell sea animals. Unlike diatomaceous earth, which can be sharp and lacerating on a micro scale, chalk is of a shape similar to a soccer ball so not abrasive. Under a microscope, you can see the tiny soccer balls pull apart the tangles that form dental plaque.