SILESIAN EARTH, in the Materia Medica, a fine aſtringent bole. It is very heavy, of a firm compact texture, and in colour of a browniſh yellow. It breaks eaſily between the fingers, and does not ſtain the hands; is naturally of a ſmooth ſurface, is readily diſſoluble in water, and melts freely into a butter-like ſubſtance in the mouth. It leaves no grittineſs between the teeth, and does not ferment with acids. It is found in the perpendicular ſiſſures of rocks near the gold mines in Hungary.