Chalk is primarily composed of calcium carbonate (CaCO3). The melting point of pure calcium carbonate is around 1339 °C (2442 °F).

However, chalk is not pure calcium carbonate. It contains impurities like silica, clay, and organic matter. These impurities can affect the melting point, making it slightly lower than the pure calcium carbonate melting point.

Therefore, the melting point of chalk can vary slightly depending on its composition.