296 iron. 



phureous odour, and melts into a brownish-coloured globule. It 

 contains, iron 47'85, sulphur 52-15, — llatchett. It is extremely 

 common, but is never worked as an ore of iron. It is principally 

 valued on account of the sulphur which can be obtained from it 

 by sublimation, and the sulphate of iron which it affords by 

 exposure to the air. 



Sp. 3. Magnetic Iron Ore. Pl. XLL fig. 2.— Gemeiner 

 Magneteisenstein, Werner ; Fer Oxydule, Werner — Its colour is 

 iron -black, with a shining or splendent metallic lustre. It occurs 

 massive, lamelliform, earthy, and crystalized, in octahedrons and 

 rhomboidal dodecahedrons. Its fracture is uneven or conchoidal. 

 Its specific gravity is 4*4. Before the blow-pipe it becomes 

 brown, but does not melt. It consists, according to Berzelius, of 

 24-14 protoxide of iron, and 71 '86 of iron. The massive variety 

 forms the well-known magnet, or loadstone, and possesses the 

 highest degree of magnetic polarity. Magnetic iron ore occurs 

 principally in beds, in primitive mountains in Norway, Sweden, 

 Lapland, and other countries. When pure, it affords excellent 

 iron. 



SpA. Iron Glance, or Specular Iron-Ore. Pl. XLI. fig. 3. 

 — Eissenglanz, Werner ; Fer Oligiste, Hauy. — The colour is steel- 

 grey, which sometimes passes into iron-black, with a brilliant, and 

 frequently iridiscent tarnish externally. It occurs massive, dis- 

 seminated, and crystalized, in plates and in minute shining scales. 

 When it occurs in "small plates or scales, it is called Micaceous 

 Iron Ore. The primitive form is an acute rhomboid. It is 

 opaque, except in thin fragments, which on the edges are of a 

 blood -red colour by transmitted light. The lustre is metallic, and 

 frequently highly splendent. Its fracture is uneven, passing into 

 conchoidal. The specific gravity is about 5. It is a peroxide of 

 iron, containing, according to Berzelius, a small portion of tita- 

 nium. It generally occurs in beds, in primitive and secondary 

 rocks, in Cornwall, and in many mines on the continents of Europe, 

 Asia, and America. It is found in great abundance in Sweden, 

 where it is manufactured into the best bar iron. The most beautiful 

 specimens of crystalized iron-glance are brought from the island 

 of Elba. 



