812 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
Another mineral, apparently emmonsite, from the W. P. H. mine, Cripple Creek, 
Colorado, has also been analyzed by Hillebrand. A, B, C are partial analyses; D is 
the mean of all. 
3 oe E 
SiO», etc.@. 1... are es 5 - 88 
sia torste eel] Re Baia a Sees 100. 00 
a By difference. Includes alkalies, and traces of magnesia, gold, and metals precipitable by HS. 
XVI. MOLYBDATES, TUNGSTATES, AND URANATES. 
POWELLITE. 
A. From the Seven Devils mining district, Idaho. Analyzed by W. H. Melville, 
and described by him as a new mineral species in Bull. 90. Sp. gr., 4.526. 
B. From Baringer Hill, Llano County, Texas. Ochreous, coating molybdenite. 
Sp. gr., 4.15. 
C. From 2 miles south of Oak Springs, Nye County, Nevada. Analyses B, C by 
W. T. Schaller. 
B20... 
Insoluble 
99. 47 | 100.07 99. 53 
a By ignition. 
HUBNERITE. 
From the Royal Albert vein, Uncompahgre district, Ouray County, Colorado. 
Analyzed by W. F. Hillebrand, and described by him in Bull. 20. Sp. gr., 7.177 at 24°. 
