EXTRA-JUMITAL SPECIES. 457 



WOLFRAM. 

 Ferrnginous Oxide of Tungsten. Cleaveland. 



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

 metallic. Opaque. Brittle. Hardness 5.0 to 5.5. Sp.gr. 7.11 to 7.40. Composed of 

 tungstic acid 67.00, oxide of iron 18.00, oxide of manganese 6.25, silica 1 .50. 



Lane's mine, and Trumbull, Connecticut. 



Mm. — Part 1L 58 



