33 2 CLAY GENUS- Not particularly heavy. Specific gravity—2,722. f •J Geognostic Situation. It occurs in primitive mountains, and is fubordi* nate to clay flate. Geographic Situation. 1c Vs found at Lauenftein in the Margraviate of Ba- reuth, in Saxony, as at Seiferfdorf near Freyberg, in Bohemia, and the ( Levant, from whence it v«s firft brought and made known in Europe. Vfe: . ... When cut and polithed it is ufed 'for fharpffiff knives and other inftruments. Obferva lions. r 1. Werner fufpefls, from its green colour, % r ^ ^ feel, and its puffing into indurated talc, that it co« tains magnefian earth. « Thi^