MINERALS. 245 
PATRONITE. 
The vanadium sulphide from Minasragra, Peru. Analyzed by W. F. Hillebrand, 
and described in Jour. Am. Chem. Soc., vol. 29, p. 1019. 
Of the sulphur, 4.5 per cent is free, the remainder is combined. The oxidized constituents represent 
impurities and gangue. . 
ENARGITE. 
From the Rarus mine, Butte, Montana. Collected by G. W. Tower. Analysis 
by W. F. Hillebrand. 
CUPROBISMUTITE. 
New species, discovered by W. F. Hillebrand and described by him in Bull. 20. 
Named by Dana. Sp. gr., 6.680 at 15°, corrected for impurities. From the Missouri 
mine, Halls Valley, Park County, Colorado. Analyses, by Hillebrand, of three 
different samples. 
2 Calculated. 
ZINKENITE. 
From the Brobdignag mine, Red Mountain, San Juan County, Colorado. Sp. gr., 
5.21 at 18°. Analyzed by W. F. Hillebrand and described by him in Bull. 20. 
15619—Bull. 419—10——17 
