382 
DESCRIPTIVE MINERALOGY. 
CLASS VII. 
METALLIC MINERALS. 
Composed either wholly, or in considerable proportion, of the Metals, commonly so called. 
ORDER I. IRON. 
This includes several minerals, of which some are of great value. 
1 . Native Iron. 
11 . 
Spathose Iron. 
2 . Magnetic Iron Ore. 
12 . 
Ankerite. 
3. Specular Iron Ore. 
13. 
Copperas. 
4. Limonite. 
14. 
Alumina-Sulphate of Iron. 
5. Iron Pyrites. 
15. 
Chrome-Iron Ore. 
6 . Magnetic Iron Pyrites. 
16. 
Vivianite. 
7. White Iron Pyrites. 
17. 
Cacoxenite. 
8 . Arsenical Iron Pyrites. 
18. 
Ilvaite, 
9. Scorodite. 
19. 
Silicate of Iron. 
10 . White Iron Sinter. 
20 . 
Hudsonite. 
NATIVE IRON. 
Fer Natif. Haily. — Native Iron. Clcaveland, Phillips and Thomson. — Octahedral Iron. Jameson. — Octae- 
drisches Eisen. Mohs. 
Description. Colour pale steel-grey. It occurs regularly 
crystallized and also massive. The primary form is the regular 
octahedron, Fig. 436. Cleavage parallel with the primary ( She¬ 
pard). Fracture hackly. Lustre metallic. Opaque. Hardness 
4.5. Specific gravity from 7.318 to 7.80. 
Composition. Specimen from Canaan, Connecticut Iron 
91.80, carbon 7.00 {Shepard). 
From Ramsdorf —Iron 92.50, lead 6.00, copper 1.50 {Kla¬ 
proth). 
This metal, which is exceedingly rare in its native state, has heretofore been chiefly found 
in those meteoric stones which have fallen at various times in different parts of the world. 
Fig. 436. 
