320 Seybert’s Analysis of Molybdenum 
Ant. XU.—Analysis of a Sulphuret of Molybdenum ; by 
Henry Seyserr, of Philadelphia. 
(Communicated for this Journal.) 
Tus mineral was found near Chester, Delaware county, 
Pennsylvania, and in its external character so much resem- 
bles that of Saxony, as to make a description of it unnecessa- 
ry. It occurs in a gangue of quartz, and is often accompa- 
nied by the sulphuret of iron. 
The specific gravity of apurcpicca was 4.444. 
Analysis. 
A. 5 Grammes reduced to minute lamine were treated 
washed and calcined, weighed 0.90 grammes, which corres- 
ponds to 0.415 grammes of molybdic acid. 
