I am eating slate chalk on a daily basis from last 5 yrs. 5 years ago I also used to eat plaster wall, mud, soil. I am very much attract from these type of things. I also want to stop for eating these things, sometime I take initiate and stop to eat for some months but after that whenever I am feeling lonely or I am alone in my home, or depress, I only think about eating slate. I am also a thyroid patient. Sometime I am really depressed. Eating slate makes me feel relax. When I am depress.