I70 NEW YORK STATE MUSEUM 



The exposures reveal fresh, unaltered rock from the very surface. 

 There is no iron stain and practically no iron silicates are in evi- 

 dence, though an occasional grain of pyrite occurs in the quartz. 

 The latter is milky white and forms unmixed masses, but mainly 

 occurs intergrown with the feldspar. There is only one kind of 

 this mineral, so far as could be established from a hasty examina- 

 tion ; the feldspar is white perthitic microcline that might readily be 

 mistaken for albite except for the lack of striations. The micro- 

 cline on close examination shows a very fine intergrowth with an- 

 other feldspar, also white, that has the optical properties of albite. 

 There is perhaps one-fourth as much albite as microcline. The in- 

 cluded bands of albite are approximately normal to both. cleavages. 

 The feldspar occurs in crystals from 6 inches to 3 feet long. It is 

 probable that a fair proportion of first-grade pottery spar 

 could be secured, but the larger quantity would have to be graded, 

 however, on account of the quartz. This opinion is based, of 

 course, solely upon the surface showing and there is need of care- 

 ful prospecting before any attempt is made to extract material for 

 shipment. 



The ledges are only slightly above the ground level and a quarry 

 would soon develop into a subsurface working that would require 

 draining. The conditions otherwise seem favorable for economical 

 work. The railroad passes within one-fourth of a mile of the 

 property. 



FOWLER, ST LAWRENCE COUNTY 



Denesia property 



A dike of pegmatite with well-crystallized feldspar occurs on 

 the farm of C. W. Denesia about 2 miles south of Fullerville, in 

 the town of Fowler. There is a single exposure which seems to be 

 of a dike, but it is too limited in area to permit much certainty 

 regarding the nature and size of the body. The outcrop is only 

 8 feet wide. With the very small area of rock exposed there is 

 a probability that the occurrence may be of greater importance than 

 is at present indicated. The feldspar occurs in splendidly developed 

 crystals from 2 to 3 feet long, inclosed in a groundmass of inter- 

 grown quartz and feldspar with which tourmaline and biotite are 

 associated. It consists of a deep red microcline and also of a lighter 

 pinkish variety that is an intergrowth of microcline and albite. 



