Folklore and history
These stones have been used in Thailand for hundreds of years as a body and foot odour prophylactic, as a cure for pimples and minor skin complaints.
Rub moistened stone into the armpits etc or apply directly to wet skin.
Mineral Salts: Ammonium, Barium, Calcium, Iron, Magnesium, Manganese, Phosphorus, Potassium, Silicon, Strontium ans Titanium
Do not leave the stone in water as it will dissolve.
If dropped on a hard surface, the stone may break.