THE ADIRONDACK GRAPHITE DEPOSITS 



91 



aroused serious interest. While individual masses of this fibrous 

 graphite seem to compare very favorably with certain grades of 

 Ceylon graphite, its limited and erratic habit prohibit any serious 

 consideration as a source of graphite. 



Here we have a very instructive display of graphite in three 

 associations. In the first place, the sedimentary schist with its 

 5 to 6 per cent of graphite ; second, the highly concentrated center 

 due to a mild form of contact metamorphism ; and third, true fissure 

 fillings of quartz with fringes of graphite. The writer wishes that 



ROWLAND 

 PROPERTY 



' 7 00T ' 



SI 

 □ 



VEIN GRAPHITE 



CRYSTALLINE QUARTZ 



fZZq GRAPHITIC MICACEOUS 

 1 1 5CH1ST& CONTACT "RK. 



YkXN. 



Fig. 20 Detailed drawing of a true fissure vein car- 

 rying graphite on the Rowland property. This is 

 situated on the south side of the trench 40 feet from 

 the portal of the shaft. G. H. Chadwick and H. L. 

 Ailing, 1917. 



graphite men could see this type with its peculiar and character- 

 istic habit and make the easy distinction between the different occur- 

 rences. One of the purposes of this bulletin is to suggest a rational 

 way of sizing up a graphite property. If the mode of origin is 

 appreciated, much worry is dispensed with. The distinction 

 between the different types is usually not difficult; here, at the 

 Rowland mine, it is possible to see the behavior of bedded ores and 

 veins and comprehend the relative values. 



