Discovery of Columbite in Chesterfield, Mass. 221 
Cleavage, parallel with M, quite perfect; in other. direc- 
tions uneven. Lateral “= vertically streaked. 
Lustre, shining, sub-metallic., .Color,.iron black 'Par- 
nished upon the cleavage ote month blue. Pesci 
ish black; powder, chocolate brown : 
Hardness. Scratches nas Brittle. ti 
— gravity, 6-00, sibel axs 
Chemical Brstinansoik ee = 
Alone before the blowpipe, in very, thin fragments,, it be- 
comes rounded upon the edges, and assumes a. glossy black 
color; but is not taken up by the magnet, even, when redu- 
ced to powder, When pulverized, it enters into fusion along 
with borax, to which it communicates a faint bottle green 
rain aie enon ye of ammonia 5 BGO it.also dissolves, 
— yellow glass, which PR EOMRB becomes 
fades to a cream col 
lee a in the state of 9 an impalpable powder, vith nitro- 
puree acid, it offered no signs of decompositio 
« After having tried to effect its ieoiioanman ha ignit- 
oe it alone, first with potash and then with carbonate of seda, 
neither, of which succeeded perfectly, I employed a. mixture 
of five parts of carbonate of Agta mes oe of.calcined borax. 
This process proved nearly effectual; and-by.the sediston-of 
two parts of nitrate a potash to the same proportions, 
iocompond trial, the whole of the mineral employe was 
con dein 
e fused mass indicated manganese. b 
— ~s which it communicated to the wae, nde 
io effect its separation from the crucible, With muriatic 
acid the green color passed to a red, and finally toa rich lem- 
on yellow; at the same time, occasioning an abundant white 
ak ins Oe 
. The muriatic solution, (2.) separated from its insoluble 
ee was digested with nitric acid; and a part of ip 
racic osed by ei in Bop. 220 the sulution beilest 
Senge pearance, 
diately settled to the bottom. The pr pba rin mas collected 
on a filter, dried, and exposed upon charcoal to the intense 
