8o NEW YORK STATE MUSEUM 



much larger, those of 5 or 6 inches in diameter being very common 

 and the largest ones taken out are said to have been nearly the size 

 of a bushel basket. As a rule the hornblende rims increase in 

 width with the size of the garnets, and the large garnets imbedded 

 in the walls of this mine present a most interesting appearance. 

 The garnet-bearing hornblende gneiss here forms an inclusion in 

 syenite fully three-fourths of a mile long and 200 feet wide. Several 

 large openings have been made in this rock. 



At the old mine on the Parker farm the rocks are a mixture of 

 granitic syenite and Grenville interbanded parallel to the strike 

 of the foliation. These bands of rock are often 20 to 40 feet wide, 

 one of them being made up of a nearly pure, granular, 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 pyroxene from the garnet. 



At the Sanders Brothers mine the mode of occurrence 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 quite badly granulated, and consists mostly of 

 intimately associated reddish brown garnet and green pyroxene 

 (coccolite?) in small grains, with sometimes a little 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 (see map). The garnet, pyroxene rock 

 is crushed, put into bags, and shipped to various parts of the world. 



Years ago an attempt was made to mine the garnets which occur 

 in the coarse, feldspar, biotite, quartz, garnet (Grenville) gneiss 

 about three-fourths of a mile east of Fuller pond. 



At the Hooper mine, near Thirteenth lake, the garnets occur as 

 crystals, often with good crystal boundaries, up to an inch or more 

 in diameter. They are thickly scattered through a medium to 

 fairly coarse-grained, dark to light gray, very gneissoid horn- 

 blendic rock which has the composition of a basic syenite or acidic 

 diorite. These garnets never show the rims of hornblende. This 

 type of occurrence has not been noted on a large scale within the 

 map limits of the North Creek sheet, though a rock almost exactly 

 like it does occur at the Rogers mine as a distinct zone (wall rock) 

 intermediate in position and composition between the typical garnet 

 gneiss and the country rock of syenite, where the garnet rock grades 

 perfectly into the syenite. 



