140 



GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



stratum of white to reddish, fine-grained, saccharoidal oligoclase, which was 

 very pure and very persistent, although nowhere reaching great thickness. 

 Prof C. U. Shepard first called this mineral a "rose-colored amphodelite 

 associated with the diaspore," ^ and later described the bed in question : 



A vein of iudianite many inches thick is found near the tunnel on the South 

 Mountain, running for many rods through the cbloritic roclf on the east side of the 

 emery vein (exterior to the gneissoid wall). Small particles of crystalline corundum 

 are diffused through the indianite.^ 



In his report he adds only that it is 2 to 10 inches thick, massive, fine- 

 granular, yellowish.^ 



In a second report Dr. C. T. Jackson writes: 



The portion of the rock originally mistaken by me for granular quartzite, and 

 called indianite by Shepard, proves on analysis to be andesine, although it is harder 

 than stated in the books, scratching quartz crystal readily. It is very compact, fine- 

 granular in texture, and has G=2.586, H = 7.5, the color slightly greenish white. I 

 obtained for its composition : 



In No. 2 there was a trace of oxide of iron not weighable. 



This fringed feldspar bed can not now be observed at the mine, nor can 

 specimens of it be obtained there. Foi'tunatel}' a large mass, representing 

 the whole thickness of the bed, with the green fringe rock attached on both 

 sides, is preserved in the geological collection at Amherst. It is a gift of 

 Mr. J. T. Ames. The feldspar is 12 inches wide and the green fringe rock 

 3 and 4 inches wide on the two sides, respectivelv. 



'Am. Jour. Sci., 2d series, Vol. XL. 1865, p. 112. 



2 Ibid., p. 123. 



=■ Report Chester Emery Mine, 1868, p. 11. 



