Dreaming of chalk means a temporary message for you to decipher. The message could help you or derail you depending on the significance of it. The importance is that you learn something from it. Similar to when you were in a classroom where all was taught with chalk, and the lessons were plenty. Try to absorb as much as possible from what your dream is saying.
In dreams, we may see a chalk in the form of a square or rectangular shape. We can also see a chalk as something that is completely blank and empty. When we dream about a chalk, this signifies that our consciousness is lacking in energy. It may also represent us being emotionally drained and lacking creativity.