463 MINERALS IN THE [December, 



Molybdate of Lead. Yellow Lead Ore, W. Plomb . 

 Molyhdatk. H. 



This beautiful salt of lead is found, though rarely, at 

 -Perkiomen. It occurs in small yellow waxy crystals, ge- 

 nerally in the interstices of quartz, or connected wath 

 the other lead ores. It was first discovered by Mr. 

 Z. Collins. 



Phosphate of Lead, Brown and green Lead Ore, W. 

 Plomb Phosphate, H. 



Locality same as the other salts of lead, where it oc- 

 curs in beautiful pale green coloured crystals, and incrus- 

 tations. 



Sulphur et of Zinc, Blende. W. Zinc sulphure, H. 



This mineral occurs in considerable quantities, at riie 

 mines on Perkiomen creek, of the yellow, brown, and 

 black varieties, generally massive, but sometimes crys- 

 tallized. Its fracture has a strong resinite aspect. It is 

 associated with barytes, and the vein is nearly six inches 

 in thickness. 



Skilphuret of Molyhdena, Molyhdena, W, Molyhdena 

 sulphure, H. 



On Chester creek, three miles from the town of 

 Chester, and about seventeen south of the city, this me- 

 tal occurs in considerable quantities, in granite. The 

 specimens from this place, exhibit the usual characters of 

 molybdena, being of a light lead grey, and bright metal- 

 lic lustre. Its structure is lamellar, and it marks, with 

 much softness, upon paper. It is said to occur here crys- 



