1818.] VICINITY OF PHILADELPHIA. 465 



Foliated Iron Ore. 



The iron ore known by this name here, frequently 

 occurs in quartz rocks, seldom thicker than the eighth of 

 an inch, and appears to be a black oxide of iron. It is 

 found at Chestnuthill and on the Wichicon. 



Jasper y Iron Ore, 



It occurs massive, in considerable quantities, in the 

 road near Springmills. Its fracture is flat conchoidal, and 

 colour brownish. 



Argillaceous Iron Ore, 



This species occurs in large quantities near Burling- 

 ton. Its colour is yellowish brown, and earthy, being 

 entirely loose. It is valued here highly as an ore, and 

 carried to the lower part of the state, where otlier ores are 

 plenty. 



Bog Iron Ore, 



This species of ore is found abundantly in New- 

 jersey, where it is wrought in considerable quantities. 



Ilydrat of Iron, Blue Iron Earth, W. Fer Phos- 

 phate. H. 



This mineral occurs crystallized and massive, and in 

 considerable quantities, near Imleytown, N.J. The crys- 

 tals are translucent, and have a laminated and radiated 

 appearance. Colour, dark blue. Before the blowpipe it 

 becomes brownish, prior to its being heated to redness, 

 but boils up when perfectly so, the bead presenting 

 a metallic appearance, and is slightly magnetic. With 



