M. W. Tles— Vanadium in the Leadville Ores. 381 
Art. XLITI.—On the occurrence of Vanadium in the Leadville 
Ores; by MALVERN W. ILEs. 
Art the Evening Star and Altna Mines, I have detected a 
vanadium mineral, ete in a pocket surrounded by a silt 
ceous gangue, and also well-defined seam. In the Even- 
ing Star mine, the v aiaitiien compound is associated with the 
so-called “ hard oucbonits of lead,” and is found as an incrus- 
and lemon- -yellow. Both the red and yel ow specimens g give a 
deep green solution when treated with hydrochloric acid, and 
not unfrequently jee Jean colored mineral gives a marked 
amount of vanadic a 
Prof. Silliman ban called — to the fact that a choco- 
late-colored mineral, fou mercies with vanadinite, also 
chloric acid was made use of: Portions of the — colored 
incrustation were detached from several specimens, and sub- 
mitted to a chemical examination; the results make it probable 
that the mineral is dechenite. The saith is as follows 
BO oui. 36°86 
PbO 38°51 
ABO oo 9°07 
V,0, pic. s Oe 
PON Gs a a 2°59 
HA) oe 2°41 
2 AOR ener, Cah re cre nt ae aes 0°48 
99°06 
precipitating the vanadium as a_ basic lead vanadate, and 
subsequently decomposing this salt by means of dilute sul- 
phare ee '; the concentrated filtrate, afer using the well- 
nown precautions to ensure removal of all traces of lead, was 
transferred to a platinum oon the sulphuric acid cautiously 
expelled, and then strong heat was applied with a blast ms 
until complete fusion of the neat eter oxide. 
* This Journal, ITI, xxii, 200, 1881; pga Ps 2 Fos, Journal, Sept. 3d. 
1881; Transactions American Institute of Mining 
