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 Monroe, county of Fairfield, 17 miles west 
from New Haven, Connecticut. 
Remark.—Native bismuth in small re has been for 
several years obtained from this mine, but the shaft has been 
sunk only about ten feet. 
ParntIl. A variety of the ore, 
‘General characters as aboye, but on some parts, there is 
seen a whitish, or yellowish, or sometimes darkish metallic 
substance ; it is in thin plates, like the leaf metal, and some- 
times reticulated, and graphic in its disposition; it is soft and 
easily cut with the knife. In the specimens examined, it wa 
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. 
ant pl —aA. Ceoncal Trials. 
Muriatic se hot! Fee ead: produces no effect; 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 anttey again Ea poe 
more acid dissolves it in part, and again Yereale yellow 
powder, which ammonia again dissolves, and so on, till nothing 
Ceres but some portion of the gangue. 
. The ammoniacal solution, which contains the oxyd of 
ene is decomposed by acids, and by heat, and instantly 
deposits a white heavy powder, becoming yellowish by standing, 
and full yellow by heat. 
