Page:Transactions of the Geological Society, 1st series, vol. 3.djvu/426

 Bournon in the Philos. Trans. 1803, is often accompanied by another coarse grained, half crystallized, loose, and more magnetic ore, by red felspar, red and white grayish phosphate of lime, and silvery coloured mica. The corundum may sometimes be found in the last mentioned iron ore, but never in the other substances, though they often make a great part of the mass. Nor has it been observed in any other variety of the Gellivara iron ores, except in a light grey coloured, fine grained, compact and very hard one, where I suspect it to be in the same close connection with the red oxide of iron as in the common emery, to which it has a great resemblance.

Geographical and Geological Remarks.

The mines of Gellivara are situated in Swedish Lapland, at 67° 10′ North latitude, about 160 English miles north-west of Torneo. The mountains in which they are wrought is almost in the center of a large country comprized between the shore of the Baltic and the Norwegian Alps, 240 miles in length, and between the two rivers of Torneo and Luleo, from 35 to 100 miles broad. The height above the Baltic is not exactly determined, but may be supposed about 1200 feet at its highest point. It rises gently on the south side, but is more abrupt on the north and east. The surrounding country is but a few hundred feet lower, and a mountain called the Dundary, at a distance of five or six miles to the east, is much higher. The whole mountain, which is about 2600 fathoms in length and from 1000 to 1600 in breadth, may be considered as a large deposit of iron ore, separated in standing layers (Stehende Lager, Werner) of different thicknesses, by a red and almost compact feldspar mixed with several other minerals. This