I 



2 



3 



4 







3-55 



1.26 . 



1. 01 



"1.58 



.28 



•13 



.08 



.65 

 .29 



' .63} 



•79 



.10 



6.40 



7-So 



6.8s 



3-49 



20.64 



87.06 

 1.68 



87.47 

 1.46 



88.94 

 1.74 



51-45 

 42.56 



31.45 

 47-38 



.05 



.02 



.04 



• 03 



.06 



186 NEW YORK STATE MUSEUM 



Insol. 



SiOj 



AWs 



Fe=Oa 



MgO 



MgCOa 



CaO 



CaCOs 



H=0 



CO, 



S 



The Gouverneur marble is quarried from a small area southwest 

 of that town. The quarries, with few exceptions, lie along a nar- 

 row belt which extends for a little over a mile in a northeast-south- 

 west direction. They lie on the outcrop of the " vein " or bed 

 which dips northwest at an angle ranging from 15° to 30° on the 

 northeast end to 80° or 90° in the southwesterly quarries. The 

 vein has a pitch that is toward the southwest at an angle of 20° 

 or 25°. There is some suggestion in the field relations that the 

 marble occurs along an overturned pitching fold. 



In color and texture the marble shows variety, though the differ- 

 ences in composition are not especially prominent. It is a mottled 

 white and grayish blue, or light and dark blue, running in places 

 to an almost solid dark blue, which is the color most sought for. 

 In the lighter mottled sorts the grain is moderately coarse and 

 somewhat uneven, with the lighter and darker calcite segregated 

 more or less into separate areas. The individual calcite particles 

 mostly have a diameter from i to 2 mm. In the dark-blue marble, 

 the grain is much finer, the calcite averaging only a fraction of a 

 millimeter. The bluish color seems to be traceable to the presence 

 of graphitic carbon in very small submicroscopic particles. Free 

 carbon was detected by R. W. Jones in the analyses already given, 

 but in too small amount to be separately weighed. That the vari- 

 ation of color conforms more or less closely to the bedding is 

 evident from a study of the relations revealed in the dififerent 

 quarries. The lighter colors are found in the overlying beds of 

 the northwestern section, and the fine-grained dark marble is from 

 the structurally lower beds on the southeast. This feature has 

 been confirmed as well by the results of core-drilling. 



The marble is susceptible of high polish and has a luster and 

 texture that resemble some gray granites. It is well adapted for 

 monumental work and the better grades are used mainly for that 



