382 



DESCRIPTIVE MINERALOGT. 



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. 



2. Magnetic Iron Ore. 



3. Specular Iron Ore. 



4. Limonite. 



6. Iron Pyrites. 



6. Magnetic Iron Pyrites. 



7. White Iron Pyrites. 



8. Arsenical Iron Pyrites. 



9. Scorodite. 



10. White Iron Sinter. 



11. Spathose Iron. 



12. Ankerite. 



13. Copperas. 



14. Alumina-Sulphate of Iron. 



15. Chrome-Iron Ore. 



16. Vivianite. 



17. Cacoxenite. 



18. Ilvaite. 



19. Sihcate of Iron. 



20. Hudsonite. 



NATIVE IRON. 



Fer Natif. Bafiy. — Native Iron. Cleavehmd, Phillips and TViomson. — 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 (SAe- 

 pard). Fracture hackly. Lustre metallic. Opaque. Hardness 

 4.5. Specific gravity from 7 . 3 1 8 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. 



