294 CLAY GENUS. T \ r-V . r; , , ■ , . .v' - - NINTH SPECIES. Pure Clay. Reine Thonerde.—Werner. Id, Wern, Cronfl. p. 176,—Id. Wid. p 385 Native, Ar gil, Kirw. t. i. p. 175 — Argilla pura, Nap. p. 246.— L’alumine pure, Broch. t. 1. p. 318 External Characters. It is fnow white, which fometimes verges on ycl* lowifh white. Occurs in fmall kidney fhaped pieces. It has no luftre. Fradture very fine earthy. Fragments indeterminately angular, and very blunt edged. Opaque. Soils very little. Adheres flightly to the tongue. Intermediate between very foft and friable. Light. Feels- fine but meagre. Constituent
