B. Silliman—Mineralogical Notes. 203 
other localities as the work of exploration goes on. Many years 
since, in a paper on the Mineralogy of the Wahsatch ad. other 
Utah ranges of mountains,* I called attention to the occurrence 
of the molybdate of lead Rapearcaage as replacing the phosphate 
(pyromorphite) among the salts of lead, the latter being rarely 
ever found there. Subsequently cP wulfenite of ‘Tecoma 
and of Kureka, in Nevada, confirmed this generalization, and I 
have since had very frequent occasion to notice the wide distribu- 
tion of wulfenite in New Mexico and Arizona. We may now 
add vanadic acid as having the same wide distribution. 
Wuilfenite crystals of rare beauty are found in the “Red 
Cloud” Mine, already mentioned as furnishing the vanadinite. 
The specimens sent me are from a depth of about 300 feet. 
They show very solid tabular crystals of ae size, brilliant 
luster, and rich orange-yellow to orange-red co 
at once suggests the presence of vanadic acid, git the well- 
known specimens from Wheatley Mines as detected by Smith. 
But I have not found a trace of vanadic acid in these Red 
Cloud or other Arizona wulfen ites From the “ Melissa Mine” 
of the same district which furnishes wulfenite nearly identical in 
form with the Red Cloud specimens, but of a little lighter 
orange-red color. © 
Orocoite-group. ite if not four of the species of this group 
occur among the ores of the Vulture de te and especially in the 
“Collateral” and “Chromate” vein ese two veins together 
with the “Blue Jay” and the “ Pholnix mine, 
of singular mineralogical interest, furnishing, among more com- 
mon miaerals, the species, crocoite, phoenic cochroite, vauquelinite, 
joassite (?), vanadinite, volborthite (?), Descloizite (?), Chileite 
(?), wulfenite. Vauquelinite occurs quite abundantly associated 
* This pa TH, iii, 195. 
