There is no difference. The other names of red stone grease are red symbol, red ridge, red stone soil, edible oil and red soil. They are the same thing, there is no difference. Halloysite, also known as red kaolin, red clay, red soil, etc. It is a silicate mineral-hydrated kaolinite family. When used as medicine, it has the effects of astringing intestine to stop bleeding, promoting granulation and healing sores, and has curative effects on chronic diarrhea, dysentery, stool bleeding, etc.