198 B. Silliman—Mineralogical Notes, 
Art. XXXIT.—Mineralogical Notes; by B. SILLIMAN. 
1. VANADINITE AND OTHER VANADATES, WULFENITE, CROCOITE, 
VAUQUELINITE, ETC., FROM ARIZONA. 
I HERE record the discovery of two important and very in- 
teresting mineral localities, or districts, in the Territory of Ari- 
zona, from one of which I have obtained vanadinite of remark- 
able beauty of color and perfection of crystalline form, associa- 
with almost equally beautiful wulfenite of an orange-red 
color; and from the other, four, perhaps more than four species 
containing vanadium. The last named district has also fur- 
nished crocoite and vauquelinite never found before, I believe, 
in North America. 
I am greatly indebted to my faithful and intelligent corres- 
pondent, Mr. George A. Treadwell, of Vulture, Arizona, for 
aid afforded me by Mr. Edward Farley, of Wickenburg, owner 
of several interesting veins, and Dr. Jones, of Phoenix. Mr. 
F. F. Thomas, lately in charge of Silverlead Furnaces, near 
Silent, in Arizona, and Mr. John McDougal, Superintendent of 
mines, have also contributed important data in extending our 
knowledge of that interesting Territory. 
Vanadinite,—This hitherto rare species promises now to be 
comparatively abundant. In the so-called “Silver District,” in 
mines, near together, the “Hamburg,” the “ Princess” and the 
“Red Cloud.” The crystals of vanadinite are extremely beau- 
1 of 
granite is somewhat irregular, but the porphyritic hanging-wall 
is well defined. I have not yet made sections of the latter rock ; 1 
closely resembles the augite trachytes of Nevada and elsewhere, 
re rere 3 f pe eae 
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