1818.] VICINITY OF PHILADELPHIA. 4^7 



Sidp/iuret of Lead. Galena. Aiken. Lead Glance, W. 

 Plomb siilphure, H. 



A considerable quantity of this species of lead ore 

 has lately been taken up, by Mr. Wetherill, at the mines 

 on Perkiomen. It occurs generally cubic^ sometimes 

 steel grained. A few specimens were found by Messrs. 

 J. Lukens and B. Say, presenting a cube with the solid 

 angles truncated, forming a triangular facet. It occurs 

 here with barytes, quartz, phosphate, carbonate and mo- 

 lybdate of lead, and red iron froth. This vein is in the 

 old red sandstone formation, and direction nearly north 

 east and south west, forming a line with the mines near 

 Newhope, Brunswick, and Schuyler's copper mine. 



Carbonate of Lead. White Lead Ore. W. Plomb car^ 

 bonate, H. 



This mineral is frequently found accompanying the 

 last mentioned one, at the same place, generally cry:^tal- 

 lized in various forms, and presenting beautiful speci- 

 mens. It is transparent, and more resinous than quartz. 



A substance which I believe to be the black carbo- 

 nate of lead is also found at this mine. 



Sulphate of Lead. Natural Lead Vitriol. W, Plomb 

 sulphate. H. 



Lately this variety of lead has been found by Mr. 

 Lukens, at Perkiomen, but not in any considerable quan- 

 tities, and generally connected with quartz, or some of 

 the sahs of lead. It much resembles the carbonate in 

 translucency, but is distinguishable by its insolubility 

 in nitric acid, , * f . 



