IS 
in the Counties of New-Haven and Litchfield. 227 
account. : ain x: 
It is very well characterized. Its structure is distinetly 
liat 
immediate gangue, and many specimens are found, in which 
it is beautifully interlaced with this mineral, and occasional- 
ly a fragment presents a ground of dark coloured spathic 
iron, with white crystals of quartz, perforating it in many 
Places, and directons and thus presenting a kind of mosaic. 
n the above description, it is presumed every mineralo- 
gist will recognize the spathic iron. This kind of iron ore 
is entirely different from that of Salisbury and Kent. It is 
essentially composed of oxid of iron, united to carbonic att 
and usually to lime ; it contains also variable proportions 0 
manganese and sometimes magnesia. It appears to be es- 
sentially a carbonate of iron, but it is rare that lime is nov 
also present. 
