406 Tungsten and Tellurium, 



Geological relations. The country is primitive, and the im- 

 mediate rock which forms the walls of the vein is said to be 

 gneiss ; (we have not seen it.) 



Locality, town of Huntington, parish of New Stratford, 

 county of Fairfield, 20 miles west from New-Haven, Con- 

 necticut. 



Remark. Native bismuth in small quantities, has been for 

 several years obtained from this mine, but the shaft has been 

 sunk only about ten feet. 



Part H. A variety of the Ore. 



General characters as above, but on some parts, there is 

 seen a whitish, or yellowish, or sometimes darkish metallic 

 substance ; it is in thin plates, like the leaf metals, and some- 

 times reticulated, and graphic in its disposition ; it is soft and 

 easily cut with the knife. In the specimens examined, it was 

 so much blended with the other ore, and so trifling in quantity, 

 that it was not possible to separate it mechanically; so as to 

 examine it separately. 



Part HI. — A. Chemical Trials. 



1. Muriatic acid, hot or cold, produces no eifect ; hot nitro- 

 muriatic dissolves the ore with energy, red fumes are evolved, 

 and generally a red solution obtained, from which ammonia 

 precipitates red oxyd of iron abundantly. 



2. A heavy lemon-yellow powder remains, insoluble of 

 course in acids, but easily and completely soluble in warm 

 ammonia. 



3. A dark powder, in diminished quantity, again appears, 

 more acid dissolves it in part, and again reveals the yellow 

 powder, which ammonia again dissolves, and so on, till nothing 

 remains but some portion of the gangue. 



4. The ammoniacal solution, which contains the oxyd of 

 tungsten, is decomposed by acids, and by heat, and instantly 

 deposits a white heavy powder, becoming yellowish by standing, 

 and full yellow by heat. 



