COMPACT GRAPHITE. 399 Constituent Parts. Graphite of Pluffier, Cdrbon 90.9 Carbon, ' 81 Carbon, 23 Iron, 9.1 Oxygen, 9 Iron, 2 Iron* - 10 Alumina, 37 100.00 Silica, 38 Hertkollet. 100 Schcele. 100 Journal des Mines, N. 12. p. 16. According to John, it sometimes contains Chrome, Nickel, and Manganese ; and Schrader mentions Oxide of Titanium as one of its ingredients. Geognostic Situation. It occurs usually in beds, sometimes disseminated, and in imbedded masses, in granite, gneiss, mica-slate, clay- slate, coal and trap formations, and probably also in trail- sition-slate. Geographic Situation. Europe.—Graphite occurs in the coal formation near Cumnock in Ayrshire, where it is imbedded in green stone, and in columnar glance-coal *. At Borrodale in Cumberland, where there is the most considerable mine of this mineral in the world; it occurs in large imbedded masses or kidneys in transition rocks. On the Continent, it is met with in the granite of Langsdorf in Bavaria; in mica-slate, near Monte-Rosso in Calabria; in gneiss in Piedmont; in serpentine in the mountain of Mora, near to Marbella in Andalusia; along with felspar at Krageroe in Norway ; and in Iceland, in trap, along with green earth * Jameson’. Mincralogical Description of Dumfriesshire, p. 161.