366 . C. T. Jackson on Bornite. - 
‘after or at the time of the ice period, the distribution of . 
plants would show a colder climate rather than the climate 
our southern shores, 
—_ 
Art. XL.—On Bornite from Dahlonega, Georgia; by Dr. 
C. T, JAcKSoN. 
_ Borntre occurs in Field’s gold mine, in Dahlonega, aoe 
in a vein of quartz, associated with native gold and some Chee 
erous iron pyrites, in hornblende slate rocks, bordering the 
River. 
The mineral is found in thick foliated masses, hannEeey 
talline structure probably hexagonal, though not pe dia y eter 
fined, masses are from half an inch to one inch in ~ nd y 
and they split like tale and mica into thin plates, quite as 
It is flexible, sectile, and soils the fingers like plam 
me 
leaves a white deposit on the cold charcoal, and near, *. . 
a ting of yellow color, and a little metallic bismuth 18 obtained, 
