80 H. Wurtz on Cobalt and Nickel. 
pyrite pyrites, blende, etc., in the vein worked at the Mineral 
westerly from the Asbury Shaft, and either on the same ¥ 
with the latter or on a closely parallel one. At this spot, how 
others with octahedral se leo in the same specimen. 
tered, being here about eight feet wide, and composed of a mix: 
ture of quartz and pyrrhotine. b 
This pyrrhotine contains, however, but traces of cobalt and 
nickel. J wish to ask here whether it is not evident from the 
above facts, that the pyrites, as well as the limonite, found in 
the upper part of the Bronson shaft, is clearly a product of the 
action of aerated water upon the pyrrhotine? The pyrr 
18 compact and massive, with a granular fracture,+ and no sp 
mens were found in the bottom of the shaft presenting in 
uons of crystallization, whilst all the pyrites found above pr 
sents, as before stated, an eminently crystalline structure, an 10 
* Am. Jour. of Science, [2], xxiii, 418. 
+ The fractured surface presents a number of small patches of 
o 
io) 
arolina 
pyrites.” ‘I could find, however, no trace of arsenic. 
warm chlorohydric acid with copious evolution of sulphohydric gas. 
