I think i found it, Bentonite clay, it is right color. It is a colen cleaner and detoxe for the body, poisons are absorbed and are locked in, passes though harmlessly. It was first used by the American Indians, then passed to settlers. This makes sence to me, we have been here so long on Grandmother S. side of the family. It is gray, you mix it with water, and she was a Heath nut as we call them today. I wonder if it would work on chickens, they eat anything, and will eat plants that are from mildly toxic to deadly. A little in their food as a natural preventative.
