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BASALT. 81 Constituent Parts. Basalt of the Ilassenberg. Basalt of Staffa. Silicdt 44.50 Silica, 50 Silica, - 48.0 Alumina, 1C.75 Alumina, 15 Alumina, 16-0 Lime, 9.50 Lime, 8 Lime, - 9.0 Magnesia, 2.25 Magnesia, 2 Soda, - 4.0 Soda, 2.60 Oxide of Iron, 25 Muriatic Acid, 1.0 Oxide of Iron, 20.00 Oxide of Iron, 16.0 Oxide of Manga. 100 Moisture, & Vo nese, 0.12 Bergmann. latile Matter, 5.00 Water, 2.00 99.9 97.72 Kennedy, Edinburgh Klaproth, Beit. Phil. Trans, vol. v. t. iii. s. 253. p. 89. Geognoslic Situation. It occurs In beds, veins, and imbedded masses, in seve ral of the floetz formations, as the first or old red sand stone formation, the coal formation, and the newest floetz- trap of Werner. It is said to be a production of transi tion districts; and it occurs in beds, imbedded masses, and veins, in primitive rocks, as granite and mica-slate. Geographic Situation. Europe.—It occurs in considerable abundance in the three great divisions of Scotland, viz. the northern, middle, and southern *, but more abundantly in the middle and Southern, than in the northern divisions. It is a rare Vol. II. p rock * The northern division of Scotland is the country to the north of the chain of lakes which extends from Loch Ness to the West Sea: the middle division the country between the Frith of Forth and the chain of lakes; andr'' the ton them division, the country between the Frith of Forth and the bon rt frs of England.