382 



DESCRIPTIVE MINERALOGY. 



CLASS VII. 



METALLIC MINERALS. 



Composed either wholly, or in considerahle proportion, of the Metals, commonly so called. 



ORDER L IRON. 



This includes several minerals, of which some are of great value. 



1. Native Iron. 



2. Magnetic Iron Ore. 



3. Specular Iron Ore. 



4. Limonite. 



5. Iron Pyrites. 



6. Magnetic Iron Pyrites. 



7. White Iron Pyrites. 



8. Arsenical Iron Pyrites. 



9. Scorodite. 



10. White Iron Sinter. 



1 1 . Spathose Iron. 



12. Ankerite. 



13. Copperas. 



14. Alumina-Sulphate of Iron. 



15. Chrome-Iron Ore. 



16. Vivianite. 



17. Cacoxenite. 



18. Ilvaite. 



19. Silicate of Iron. 



20. Hudsonite. 



NATIVE IRON. 



FerNatif. Bauy. — Native Iron. Cleavdand, Phillips and Thomson. — Octahedral Iron. Jameson. — Octae- 



drisrhcs Eiscn. Alohs. 



^^' ^^^' Description. Colour pale steel-gi-ey. It occurs regularly 



crystallized and also massive. The primary form is the regular 

 octahedron, Fig. 436. Cleavage parallel with the primary (SAe- 

 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 (S'Acpcrr^?). 



From Ramsdorf—hon 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. 



