EXTRA-LIMIT \L SPECIES. 457 



WOLFRAM. 



Ferruginous Oxide of Tungsten. Ckavchind. 



Colour dark greyish, or brownisli black. Crystallized and massive. Lustre brilliant, often 

 metallic. Opaque. Brittle. Hardness 5.0 to 5.. 5. Sp.gr. 7.11 to 7.10. Composed of 

 tungstic acid 07.00, oxide of iron 18.00, oxide of manganese 6.25, silica 1 .50. 



Lane's mine, and Trumbull, Connecticut. 



MiN. — Part II. 58 



