QUARRY MATERIALS OF NEW YORK I4I 



associated with it, as well as some pyroxene. The feldspars in- 

 clude orthoclase, microcline and microperthite among the alkali 

 varieties. Plagioclase is represented in amount quite equal to the 

 others, so that the composition approaches a diorite. The quartz 

 carries abundant inclusions but otherwise is not especially remark- 

 able. Less important constituents are titanite, zircon, magnetite 

 and allanite, the last being quite common in the granite from both 

 quarries. 



Pochuck Mountain quarries 



The principal quarry working in the Pochuck granite area is situ- 

 ated just north of the State boundary and on the east side of the 

 mountain. It is reached by the branch railroad that connects Pine 

 Island on the main line with Glenwood, N. J. It was opened about 

 1890. The property was developed and worked by the Empire 

 State Granite Co., but has been inoperative for the last four or 

 five years. Building stone and paving blocks were quarried. Among 

 the structures in which the granite has been used are the post office 

 and the Hinchcliffe brewery at Patterson, N. J. 



The quarry is opened for a distance of 200 feet along the moun- 

 tain and has a face from 30 to 40 feet high. The excavation is 

 insufficient to show the general rock structures. There appears, 

 however, to be no well-defined sheeting. 



A second smaller quarry has been opened a little south of this 

 property, but is also idle at present. It belongs to P. J. Carlin of 

 New York City. The granite is of the same general character as 

 that in the Empire State quarry. 



The granite from this locality has a coarse texture, varying from 

 massive to slightly foliate, and a pink body that is mottled with 

 gray and black. The general color effect is pinkish gray of medium 

 shade. The feldspars measure about 10 mm and the black aggre- 

 gates of hornblende and biotite from 5 to 10 mm in diameter. 

 The granite in hand specimen shows no weathering or discoloration. 



Microscopic examination. The feldspars, which are the most 

 prominent constituents, include microcline, microperthite and ortho- 

 clase of pink color and a whitish soda-lime variety, all in practically 

 unaltered state though somewhat fractured by compression. Quartz 

 is next in amount. The hornblende greatly predominates over 

 biotite and is a strongly pleochroic, dark green to brown variety, 

 showing slight chloritization. Large crystals of titanite are included 

 in .the dark aggregates of hornblende and biotite. Zircon, apatite, 

 magnetite and biotite are present in small quantity. The absence of 

 carbonates is indicated by hydrochloric acid tests. 



