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Slate Clay. 313 Adheres a little to the tongue. I'eels meagre. Kot particularly heavy, approaching to light. Specific gravity.—■According to Ksr-wan, from 2,602 to 2,680. Geognostic Situation. It occurs in beds and ftrata ? It is an almoft con- ftant attendant of coal; and it is found alfo in the neweft floetz trap and alluvial formations. Geographic Situations. It is found generally wherever the coal, floetz trap, ^ r *d alluvial formations occur, fo that its diftribution ,s univerfal. Obfervaiions. *• According to its external charaflers it (lands 'tween potters clay and clay Hone, and fometimes particularly the dark variety) paffes into bituminous 3 * It is fufliciently diftinguifhed from clay flate'by s colour, inferior hardnels and weight, its adheuon S f t«>