RECENT MINERAL OCCURRENCES IN NEW YORK CITY 



AND VICINITY 



BY H. P, WHITLOCK 



PYRITE FROM KINGSBRIDGE 

 Sqme interesting pyrite crystals from this locality were described 

 in 1893 by Prof, A. J. Moses of Columbia University.^ These 

 crystals which are shown in figure i (reproduced from figure i of 

 Professor Moses' paper), average 8-15 mm in diameter, and were 

 found in a cavity in crystalline dolomitic limestone associated with 

 dolomite, transparent green muscovite, quartz and some minute 

 crystals of rutile. They show only the common forms a (100), 

 0(111), ^(210), n(2ii) and .s'(32i). Professor Moses noted a 

 marked tendency to striation in the zone [iii. 210], as well as a 

 somewhat less pronounced striation tendency in the zone [100. iii]. 

 This would appear to be due to incipient development of the forms 

 (211) and (321). 



/ / 



^=7 



■;^p 1 





L-^ 



VT. 



^^^^J> \ 



\ 



/=^ 



a 



~tX^^ 



V 



a 



*"'^^^><\ 



\ 



e 



e 



J 



^ 



\v 



y 



-W/ 



V ^ 



=?=k: 



=r / 



^^<^ J / 



Fig. 1 



Fig. 2 



Fg. 3 



The writer was recently enabled, through the courtesy, of Mr 

 James J. Manchester of New York and of the New York Miner- 

 alogical Club, to study several specimens from Kingsbridge, which 

 proved to be of more complex crystallographic development than 

 those described by Professor Moses. 



The specimen loaned by Mr Manchester and which was collected 

 by him during the past year consisted of a single small crystal meas- 

 uring 3 mm in diameter and developed with almost diagrammatic 

 symmetry. The faces which are sharp and brilliant gave excellent 

 images of the signal. This crystal, which is illustrated in figure 2, 

 shows besides the forms previously recorded from the locality the 

 forms c^(iio), o-(52o), o (650), /^ (221) and ^(421), all of which have 



lA. J. Moses. 



Am. Jour. Sci. 1893, 45,488. 

 [183] 



