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CLAY GENUS. , FIRST , K I N D.. r ’ ( L«!: " Earthy potters Clay. a • External Characters. It colours are yellowilh and greyilh white; alfo greenilh, blueilh and frnoke grey, and thefe colours are of various degrees of intenfity. The greenilh grey fometimes paffes into mountain green, but this is rare. Occurs maffive,* and in confiderable malTes. Fra&ure in the fmall pretty fine earthy, in the great coarfe grained uneven. Fragments indeterminately angular, blunt edged. Opaque.- ... Colours a little. Very foft palling to loofe. Adheres ftrongly to the tongue- Feels a little greafy. Not particularly heavy, approaching to light. si •. ■ ! r )rroj e SECOND