1897.] 



NEW YORK ACADEMY OF SCIENCES. 



327 



ALLANITE CRYSTALS FROM MINEYILLE, ESSEX 

 COUNTY, N. Y. 



By Heinrich Ries. 



(Read March 15, 1897.) 



The crystals described below were recently collected by Prof. 

 J. F. Kemp, at the dumps of the now abandoned Cook shaft, 

 near Mineville, Essex Co., N, Y.,* and were kindly loaned to 

 the writer for description. They occur in a very coarse peg- 

 matite of quartz and orthoclase, but are themselves, as a rule, 

 embedded in a matrix of milky quartz. Although allanite is a 

 comparatively rare mineral, it is found at this localit}' in great 

 abundance and in crystals of exceptional size. The large crys- 

 tals, as a rule of rude outline, may reach an inch in thickness 

 (25 mm.) and a length of five or six inches 1(12.5-15.0 cm.). 

 Even larger ones were reported by W. P. Blake, in September, 



1858, from the Sanlbrd ore bed (now called the Old Bed) that is 

 about a mile distant from the Cook shaft,f but so far as can be 

 learned the old locality has either been destroyed in mining or 



* J. F. Kemp. The Geology of the Magnetites near Port Henry, N. Y., and especially 

 those of Mineville. '.Trans. Arner. Inst. Min. Eng., Chicago meeting, February, 1897. 

 Reprint pp. 26, 51 and Plate 43. 



t See American Journal of Science, September, 18.58, p. 245. 



