402 PHYSIOGRAPHY. CLASS n. 



nat, which contain so much of copper-ore at Moldawa, Saska, 

 Orawitza, &c. consist in a more northerly direction, at 

 Dognatzka, almost entirely of the present species. 



4. Large masses of octahedral Iron-ore are found at 

 Arendal in Norway, the Taberg in Smaland in Sweden, 

 and Chili ; also in North America. It occurs at Berggiess- 

 hiibel and Schmalzgrube in Saxony, at Presnitz in Bohe- 

 mia, in the Schmalenberg in the Hartz ; near the Abbey 

 of Pella in Stiria, along with rhombohedral Iron-ore, at 

 Kahlwang with granular limestone, and in many other 

 places along the chain of the Alps. It is likewise met with 

 in Corsica, in Unst, one of the Shetland isles, in Russia, 

 Silesia, &c. Imbedded crystals are very frequent ; among 

 these the rare hexahedron occurs in the Gulsen mountain 

 near Kraubat in Stiria. Well defined crystals occur at Ve- 

 suvius, and Traversella in Piedmont. 



5. The present species is one of the most important ores 

 of iron, and large quantities of that metal are annually ex- 

 tracted from it in Sweden, Norway, Russia, and other 

 countries. 



6. It is highly probable that the Iron-Sand will be esta- 

 blished in future into a particular species. Its specific gra- 

 vity never exceeds 4-9, it was found = 4-871 in perfectly 

 pure grains, while that of cleavable varieties of octahedral 

 Iron-ore never is below 5-0. Also several other properties 

 indicate such a difference, as the distinct imperfect metallic 

 lustre, even a slight difference of colour, and the entire 

 want of regular forms, as it cannot be said with perfect se- 

 curity whether the octahedrons quoted, really belong to 

 the present species. According to CORDIER, it consists of 



Protoxide of Iron 79-20. 



Oxide of Titanium 14-80. 



Oxide of Manganese 1-60. 



Alumina 0-80. 



It occurs in the Bohemian Mittelgeburge, in the moun- 

 tains of the Rhon, at Andernach on the Rhine ; also in 



