98 NEW YORK STATE MUSEUM 



shows : 20 per cent orthoclase ; 25 per cent oligoclase to labrado- 

 rite ; 50 per cent hornblende ; 2 per cent biotite ; 2 per cent mag- 

 netite ; together with a little pyrite, zoisite, and apatite. As com- 

 pared with the similar rock from the Rogers mine the lack of 

 hypersthene is noteworthy. Imbedded in the gray matrix are 

 numerous shattered, reddish-brown garnets (almandite) which 

 range in size up to several inches in diameter. Black hornblende 

 rims are invariably present around the garnets. 



This garnet rock is a long, narrow, Avell-defined inclusion of 

 Grenville gneiss in a granitic facies of the great syenite-granite 

 intrusive body. 



This mine has not been v/orked for about twenty years. After 

 blasting out the garnet-bearing rock and reducing it by sledge 

 hammers, the garnets were picked out by hand. 



3 At the Rexford mine the type of occurrence is much like that 

 of Oven mountain, only here there appear to be several smaller 

 inclusions of the garnet-bearing gneiss instead of one, and the 

 country rock is a very gneissoid quartz-syenite. Garnets up to 

 five inches across, always with hornblende rims, were noted. 

 There are several mine openings but none have been worked for 

 about fifteen years. 



4 The old mine on the Parker farm occurs in a mixed gneiss 

 area with granitic syenite and Grenville interbedded parallel to 

 the foliation strike. These bands of rock are often twenty to 

 forty feet wide, one of them being made up of a nearly pure, 

 gra ular, medium grained mass of irregular crystals of reddish- 

 brown garnet and bright green pyroxene (coccolite?). About 

 twenty years ago this band of garnet rock was mined, crushed 

 and put into barrels, there being no attempt to separate the py- 

 roxene from the garnet. 



5 At the Sanders Brothers mine the mode of occurence is 

 very similar to that of the Parker mine, the bands of Grenville 

 being, however, somewhat less pronounced and numerous. The 

 rock which is mined is pretty badly granulated and consists 

 mostly of intimately associated reddish-brown garnet and green 

 pyroxene (coccolite?) in small grains, with sometimes a little 

 quartz and feldspar. There are some streaks or patches of nearly 

 pure garnet. Work began in 1907 on the south side of the creek, 

 but now all the mining is confined to the north side. The garnet- 

 pyroxene rock is crushed, put into bags, and shipped to all parts 

 of the world. 



