Chalk in dreams is usually a sign which shows that you will have certain health problems, but not serious ones. Sometimes the occasional dream of chalk announces occasional money problems.
Dream dictionary: Chalk dream meanings
…For a woman Dreaming of chalking her face, denotes that she will scheme to obtain admirers. Dreaming of using chalk on a board, you will attain public honors, unless it is the blackboard | then it indicates ill luck. To hold hands full of chalk, disappointment is foretold….
See chalk means profit and gain in important aspects of your life.
Health discomforts without danger. Occasional money problems.
To see in your dreams writing in white chalk on a blackboard, denotes ill tidings of some person prostrated with some severe malady, or your financial security will be swayed by the panicky condition of commerce.
…The significance of stones (precious and other-wise). Amethyst, success in courtship; blood-stones, legacies; coral, a birth; cornelian, treachery; diamonds, drowning; emeralds, great success in the arts; jasper, inconstancy; opal, separation, divorce, rapture in friendships; pearls, great sorrow; rubies, lover’s kisses; turquoise, the breaking off of an engagement; sapphires, a wedding; common pebbles, petty troubles; black rocks, illness and death; sand, a serious calamity; chalk, ailment or death of a child; granite, accident on land; marble, death.To dream of teeth coming out portends illness or death, but not necessarily of the dreamer. For example, a man told me that, on the night preceding the death of one of his brothers, he dreamed his teeth fell out, and that on one of them was a portrait of the brother who died….