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3»© CLAY GENUS. FIFTH SUBSPECIES. Clayftone. Thonftein.—Werner. External CharaHers. Its mod common colours are grey and red. Of grey it prefents the following varieties: greenifh* bluifh, afh, fmoke, and pearl grey; from pearl grey it paffes into brownifh red. It is fometimes marked by yellowifh brown fpotted and ftriped delineations. It occurs maflive. It is dull. Fra&ure generally fine earthy, which fometimes paffes into fine grained even, fometimes into flaty* and even fplintery ; fome varieties are flat conchoidab with a tendency to flaty. Fragments indeterminately angular, feldom tabular* jmd not particularly fharp edged. It is opaque. Soft, approaching to very fofr. Not particularly brittle. Pretty eafily frangible. Does not adhere to the tongue. Feels rather meagre. Gcogno sUi