Ann, My grandfather Philip Henry Amyx and grandmother Mary Catherine (Fannin) Amyx moved from Morgan County, Kentucky to Oklahoma (Indian Territory) in 1906. From family stories, he had a "madstone" he brought from Kentucky with him. The stone was 2 1/2 inches in diameter, slate gray and not completely round. The stone was used for snake bites and dog bites, etc. The stone was also used on livestock. Story is that my grandfather traded for it from an Indian in Kentucky. The stones are supposedly found in cow and deer stomachs. They soaked the stone in milk before applying it to the bite. A foam-like substance (green and yellow) would form and fall off. The procedure was repeated until the foam-substance would quit forming. A member of our family still has 1/2 of the stone which was broken in two pieces. Don't know if this is what you want - but thought interesting. Peggy Walker