MINERAL RESOURCES OF THE STATE OF NEW YORK 75 



and over 50 feet high and shows a coarse pegmatite, with white and 

 red feldspars in masses 3 or 4 feet across. The white variety which 

 appears to be albite is predominant ; this is one of the few occurrences 

 in which the soda spar is in excess over the potash variety, the latter 

 being usually much the more common. The iron-bearing minerals 

 are biotite and tourmaline. The quarry offers favorable conditions 

 for the extraction of soda spar which is in considerable demand for 

 producing enamels and glazes on wares that are fired at relatively 

 low temperatures. 



Undeveloped pegmatite bodies are found at several places in this 

 vicinity. 



De Kalb. In the town of De Kalb, St Lawrence county, on the 

 Rowland farm along the highway from Bigelow to East De Kalb, is- 

 an occurrence of pegmatite that is made up almost entirely of feld^- 

 spar and quartz, no dark minerals appearing in the outcrop. The 

 feldspar is perthite, or an intergrowth of the potash and soda varie- 

 ties in proportion of two or three parts of the former to one of the 

 latter. The quartz is abundant, but by sorting much of the spar 

 could probably be shipped as first grade. Individual crystals meas- 

 ure up to 3 feet long. The absence of iron silicates is noticeable and 

 adds to the value of the occurrence for quarry purposes. The prop- 

 erty has recently come under development, and shipments of pottery 

 spar have been made during the past two years to Trenton, N. J. 



Fine. Several deposits of pegmatite outcrop on the Fred Scott 

 farm, 4 miles north of Oswegatchie, in the town of Fine, St Lawrence 

 county. The feldspar is seldom free of admixture with other sili- 

 cates. The occurrences are of interest mainly in connection with 

 the well crystallized minerals to be found in them, the different species 

 including pyroxene, hornblende, titanite, fluorite, pyrite and chal- 

 copyrite. There is an abundance of pegmatite in this and the 

 adjoining town of Fowler where a coarse granite outcrops in force, 

 and doubtless some may be found that has economic character. 



Kushaqtia. About 4 miles from this place, in Franklin county, 

 on the slope of Sable mountain is a pegmatite deposit that is reported 

 to be very large. Samples show that the principal feldspar is micro- 

 cline of reddish color and somewhat stained by iron. It occurs in 

 rough masses rather than crystals and is admixed usually with other 

 silicates — hornblende, biotite and tourmaline. The body has been 

 prospected but not actively worked. The occurrence is too remote 

 to merit much attention at present, particularly as the run of spar 

 is hardly of first quality. 



