Il8 NEW YORK STATE MUSEUM 



sections exaniinccl a small i:)roporlioii of the flakes showed partial 

 or complete change to chlorite. The amount of iron set free from 

 the biotite in any case is entirely insufficient to produce the present 

 color. 



Chemical and physical features. The following data in regard 

 to the granite was supplied by the Mohegan Granite Co. in 1904 in 

 response to the request from this office. The tests were made on 

 four separate samples in the laboratories of Ricketts & Banks. 

 It was not specified whether they were based on the yellow or the 

 gray variety. 



Crushing 

 Iron Sulphur Specific strength 



Sample per cent per cent gravity lbs. a sq. in. 



1 .34 .015 2.64 21,979 



2 .86 trace 2.62 19,303 



3 -30 .022 2.64. 12,547 



4 I. IS .015 2.67 16,889 



The lower crushing strength of no. 3 is accounted for by a defect 

 in cutting the sample which resulted in the loss of a chip from one 

 corner. The tests evidence the physical soundness of the granite 

 and confirm the results of quarry and microscopic examinations. 

 The weathering qualities of the granite are considered excellent. 

 The pyrite content as indicated by the sulphur percentage is too 

 small to have any influence. 



A sample of the light gray granite tested by the writer had a ratio 

 of aibsorption of .319 per cent and pore space .829 per cent. The 

 yellow granite showed a ratio of absorption .368 per cent, pore 

 space .962 per cent. 



An analysis of the granite from this quarry by Elwyn Waller 

 is given herewith : 



SiOs 73-32 



AI2O3 15.01 



Fe203 .47 



FeO 1. 19 



MgO 15 



CaO 1.35 



Na20 4.27 



K.0 3.72 



H2O+ 13 



TiO. 06 



MnO trace 



Total 99.67 



