420 Dr. Genth’s Contributions to Mineralogy. 
nickel, but I am not aware that a scientific examination of the 
_pure mineral has ever been made. This may be owing to the 
difficulty in obtaining pure material, as it is always mixed with 
galena, chalcopyrite, marcasite, etc. I have endeavored to pick 
it out as pure as possible, and have pretty well succeeded in 
removing the greater portion of the remaining galena by previ- 
ously treating it with strong and boiling chlorhydrie acid. 
The siegenite from this locality is rarely found in crystals; 
those which I have observed were both octahedra and cubo-octa- 
hedra. Its cleavage is very indistinct; the color between steel- 
grey and tin-white. It dissolves in nitric acid without separa- 
tion of sulphur. The analysis gave the following results: 
Sulphur, . - - 41°54 p.c 
“ ad, m F 3 O39. 
Nickel, 30°53 “ 
obalt, - - a ST Oe 
ron, 7 3°3 “ 
Insoluble, 301 2 
{ 98°24 
with traces of copper and antimony. 
5. Enargite (?) 
__In small cavities of a hornstone-like quartz at the Brewer's 
Mine, Chesterfield District, S.C., occurs very rarely an iron- 
black mineral with metallic lustre and perfect rhombic cleavage. 
Iam indebted to the State Geologist of South Carolina, Oscar 
M. Lieber, Esq., its discoverer, for a small specimen of it. : 
r. Lieber in a qualitative examination found it to contain 
sulphur, arsenic and coppe 
is: 
~ Balphor, — - : : = z ‘ 33°78 
a ee 
pe s : ; 
100°00 — 
Until larger quantities can be obtained, which permit of a more 
complete investigation, I think I am justifiable in calling this 
be an re 1 Enargite. : : 
