ADIRONDACK MAGNETIC IRON ORES 145 



structure. The granular ore has a fine texture; the particles of 

 magnetite are intimately intermingled with pyroxene, hornblende, 

 quartz and feldspar. Veinlets of jasper and white quartz are quite 

 common. Pyrite occurs in noticeable quantity on the east end of 

 the zone, but is not much in evidence elsewhere. When examined 

 under the microscope, sections of the rich ore show inclusions of 

 augite, quartz and apatite, but the proportion of these minerals to 

 the whole mass is small and the material would be classed as ship- 

 ping grade. The lean ore would require concentration. An 

 analysis furnished by the Salisbury Steel & Iron Co. shows the 

 following composition: 



Fe 3 4 86.99 



Si0 2 6.39 



S 034 



?A 1.36 



A1 2 3 , i-*4 



MnO 46 



CaO 2.83 



MgO 65 



99.854 



Iron 62 . 99 



Phosphorus .52 



