Slate Spar. r Intermediate between mild and brittle. Pretty eafily frangible. Not particularly heavy. Constituent Parts. Almoft entirely compofed of carbonate of lime. « Geognoliic Situation. It occurs in limeftone beds in primitive mountains. Geographic t Situation. '• It is found at Konigfberg in Norway ; . at Bergrun, near Schwartzeuberg in Saxony, where it is accom panied with lead glance and brown blende y and in Cornwall. SIXTH