1874.] 



91 



[Genth. 



Silicic acid 



Quartz 



Water 



4.25 

 3.60 



12.41 



100.00 

 100 Iron contain 0.28 Phosphorus. 



No. 29. Pennsylvania Bank. 



a. Two samples received for examination. 



Amorphous brown compact ore mixed with ochreous yellowish or red- 

 dish ore ; Porous, some of the cavities lined with a very fine coating of 

 fibrous ore. 



h. So-called Pipe ore. 



Amorphous porous ore, in columnar masses, the cavities filled with fer- 

 ruginous clay. 



c. Quartz grains, cemented by brown amorphous limonite, and dis- 

 seminated through it, patches of hydrous manganic oxide and perhaj)s of 

 psilomelane. 



= 57.10 Metallic Iron. 



0.07 Phosphorus. 



100.00 

 100 Iron contain 0.12 Phosphorus. 

 Pipe Ore. 



= 58.62 Metallic Iron. 



= 0.06 Phosphorus. 



