QUARRY MATERIALS OF NEW YORK 173 



bounded, reaching diameters of 6 or 8 inches. It is usually opaque, 

 yellowish green in color. The rare compounds, autunite, cyrtolite 

 and uraconite all of which contain uranium are listed by Luquer 1 

 as occurring at Bedford. The first-named occurs rather frequently 

 as a bright greenish-yellow deposit on the feldspar and mica. 

 The writer has recently observed the presence of columbite in 

 crystalline masses of considerable size. 



In connection with the quarry, P. H. Kinkel & Sons operate a 

 mill for grinding the spar. The equipment consists of a breaker, 

 chasers and screens with a pebble mill for the fine grinding of 

 pottery spar. This is a recent addition, as formerly only the second 

 and third grades were ground, for which purpose the final reduction 

 was accomplished in a ball mill. 



The output of the quarries is shipped from Bedford station on 

 the Harlem branch of the New York Central, necessitating a 

 haulage of 5 miles. 



Quarry of Bedford Feldspar Co. 



This new opening lies at the base of the hill and a few hundred 

 feet north of the Kinkel quarry. The continuation of the pegmatite 

 in that direction was concealed by a cover of soil and earth and 

 was first explored by test holes before development work was 

 begun. 



The existence of the pegmatite rather indicates that the mass is 

 not a dike in the usual sense of the word, but another of the 

 rounded bodies or stocks that constitute the usual mode of occur- 

 rence of the larger masses. If a dike, it does not conform in direc- 

 tion with the general structure of the gneisses, but has a northerly 

 strike. The great width of the body exposed in the Kinkel quarry 

 is exceptional for a dike. It is possible that the present quarry 

 is on a separate intrusion, but this scarcely seems likely in view 

 of the character of the material. 



The working is all below the ground level and when seen in the 

 spring of 191 3 was about 30 feet deep with a diameter of 75 feet. 

 The pegmatite is the same coarse aggregate as found farther south 

 but carries a larger proportion of feldspar than the average in the 

 Kinkel quarry. The material is somewhat stained and decomposed, 

 but fresher material should be found in depth. 



1 " The Minerals of the Pegmatite Veins at Bedford, N. Y." The American 

 Geologist, v. 18, 1896, p. 259-60. Also American Geologist, v. 38, 1904. 



