80 NEW YORK STATE MUSEUM 



surface is quite attractive, as it is also rare among stones of this 

 class. The coarser grained material is not the result of pegmatitic 

 injection, but a variation produced from different conditions of 

 crystallization, probably in a stage of resoftening of the original 

 rock. The granite belongs to the Adirondack granite gneisses and 

 is composed of feldspar, biotite and quartz, the last in rather small 

 amount for true granite, with some hornblende, magnetite, zircon 

 and chloride alteration products. It is a well-preserved strong 

 stone. A crushing test made at the Clarkson School of Technology 

 at Potsdam showed an ultimate resistance of 20,000 pounds to the 

 square inch. The chemical composition, as determined by L. K. 

 Russell, is as follows : 



S1O2 66.78 



AI2O3 13.01 



Fe 2 3 6 . 50 



MgO .92 



CaO 1 . 3 1 



Na20, K2O 10.89 



H2O 51 



Total 99 . 92 



The quarry is operated by the St Regis Red Veined Granite 

 Co. A sample of the granite in the State Museum shows a good 

 polish and very attractive pattern. Monumental stock is the main 

 product. 



LIMESTONE 



The stone classified under the heading of limestone consists for 

 the most part of the common grades of limestone and dolomite 

 such as are characterized by a compact granular or finely crystal- 

 line texture and are lacking in ornamental qualities. 



A smaller part is represented by crystalline limestone and by the 

 waste products of marble quarrying which is sometimes employed 

 for crushed stone, lime making or flux. Limestone used for the 

 manufacture of portland and natural cement is, however, excluded 

 from the tabulations so as to avoid any duplications of the statistics. 



Limestones have a wide distribution in the State, the only region 

 which is not well supplied being the southern part where the pre- 

 vailing formations are sandstones of Devonic age. The micro- 

 crystalline varieties occur in regular stratified order in the Cambric, 

 Lower Siluric, Upper Siluric and Devonic systems. In most sec- 

 tions they occupy considerable belts and have been little disturbed 

 from their original horizontal position. On the borders of the 



