378 On Metallic Minerals. 



always to accompany a portion of the rock or gangue that 

 bears a remarkal)ly pseiido volcanic aspect. 



SIXTH ORK BED. 



Southwestvvard of ''Fosters Ore Bed/' about a mile, 

 another is found on the bordei- of a marsh. It has been 

 worked and several tons of ore have been taken away, but 

 like the last mentioned bed it has experienced a temporary 

 neglect, and for the same reason. Its ore, however, appears 

 to be much easier extracted, and much more abunchmt. — 

 Large crystals of iron upon the surface of some of the ore, 

 and the pavonine tarnish on others, characterize this bed. 

 It is magnetic, but contains much sulphur. Mr. Manahan, 

 informs me that some portion of this ore is used in the 

 furnace as an alloy ore, but other portions which are free 

 from sulphur are ecjual to the best. 



MINERALOGICAL CHARACTERS. 



1st. — As has been said, some of the ore in tiiis bed is 

 characterized by having large crystals of iron upon its 

 surface. These crystals appear, to be always some 

 modification of the octohedron. Tlie faces of the crys- 

 tals are oblique rhombs, and are striated in lines parallel 

 to the longest diagonal. It is seldom that more than 

 five faces can be seen, as the others are either obliter- 

 ated by the body of the ore, or what is more j)robable, 

 never were formed. This ore is darker than any of the 

 preceding; of a compact structure; very magnetic ; specific 

 gravity, 4-6, &c. &c. 



2d. — A course granular variety of ore is obtained here, 

 the cross fracture of which shows the pavonine or iridescent 

 tarnish. It is very magnetic, and has a specific gravity 

 of 4-9. 



Almost all these beds appear to have, as in the present 

 instance, a dip and direction towards the north. 



