dantly in three associated mineral vein 
on Utah, Calijornia and Nevada. 127 
variety. Its specific gravity is 4861 in fragments to 5-111 
ome 
time ago the following approximate analysis of the Shoebridge 
mineral made by the chlorine method upon carefully selected 
Sulphur ae in 1°06 
mwUMONY 8: 95 Wei 2 bap ec ek trace 
Arsenic 17°20 Resi 
due (undissolved), trace 
100°50 
The silver was not determined. The iron is probably due to 
the pyrite, with which the species enargite is intimately associ- 
ated ; this occasions also the excess of sulphur, in the analysis, 
which corresponds, however, sufficiently well with the formula 
ae above 
quite free from ite. The blowpipe shows it to be free, or 
nearly so, from anenciy. This Tpalit has not furnished the - 
enargite otherwise than in columnar and cleavable masses. 
The mineral from Dragon Mine resembles the last named 
Hes ee is more massive. Neither of the two latter varieties 
have been analyzed. 
2. Bismuthinite, B?S%.—This species is found rather abun- 
s in Granite Min- 
* Wrongly quoted in Dana (sth ed.), p. 797, as in vol. xlv. 
