70 NEW YORK STATE MUSEUlVf 



injurious ingredients and practically fresh at the surface. The fol- 

 lowing analysis of a sample of the granite is by R. W. Jones : 



Si O2 72.69 



AI2 O3 14. II 



FejOs .26 



FeO 2.89 



Mg O .28 



Ca O .64 



Na2 O 2.37 



K2 O 5.16 



H2O+ .24 



H2 O— .02 



98.66 



Sulfur was tested for but not found. The minor constituents 

 including manganese, phosphorus and zirconium, the presence of 

 which was indicated by microscopic analysis, were not estimated. 



The granite is bordered on the west by a great intrusion of syenite 

 that is estimated by C. H. Smyth, jr, to cover not less than 75 square 

 miles. The syenite is a grayish green to dark green or nearly black 

 rock composed largely of feldspar but containing considerable 

 amounts of pyroxene, amphibole and magnetite. In its original or 

 unaltered phase it has a coarse massive texture, but the general 

 appearance is that of a granulated and more or less recrystallized 

 rock, showing much more evidence of pressure metamorphism than 

 the granite. The syenite is not adapted for building stone on account 

 of its somber color. For engineering purposes it should prove very 

 serviceable. 



Quarries in Clinton and Essex counties. In the eastern Adiron- 

 dacks the available quarry materials suitable for architectural and 

 monumental work consist of granite, syenite and anorthosite. These 

 formations are of widespread occurrence but in comparatively few 

 places do they possess the qualities requisite for cut stone as they 

 have been largely metamorphosed into gneisses and schists. The 

 unreduced or slightly modified residuals of the igneous intrusions 

 which are found here and there along the borders afford the basis 

 for quarry operations. 



The vicinity of Ausable Forks presents many advantages for 

 quarrying in connection with both anorthosite and syenite. For 

 several years past a considerable quantity of monumental stone has 

 been shipped from this section, and recently additional developments 

 with a view to the extraction of all classes of rough and cut stone 

 have been planned. 



The Adirondack Granite Co., formed in 1910 as a consolidation 



