192 On the Mineralogy of Ncvi York- Island. 



rutile at Kingsbridge, and in the collection at Barnum's 

 Museum are very good specimens of titanium, said to have 

 been found near McComb's Dam. 



Professor Stone had some interesting specimens of pyroxene 

 from the quarries of limestone near Kingsbridge, and tremolite 

 is reported from the same locality. 



The occurrence of vivianite and ajjqphyllite at Harlem, is- 

 mentioned by Beck in his report upon the mineralogy of the 

 State, but I have never seen specimens of either, known to 

 have been found within the county of New York. Nor have 

 I seen staurotide, reported by the same author, except a few 

 very poor crystals from the mica slate upon the railroad track 

 on the North. River* 



In a report made about the time of the laying out of the 

 Central Park, it was stated that tetraphyline had been found 

 within the limits of the Park near 60th street, and the line of 

 7th avenue. At 1st avenue, and in other places,. I have 

 observed a dark brown mineral resembling aluardite, or some 

 of the like phosphates of manganese. 



One other species of doubtful identity, but precisely resem- 

 bling uranite, I found on the lands belonging to Columbia Col- 

 lege, between 5th and 6th avenues, and Mr. Pohle reports hav- 

 ing met with the same mineral on the northerly part of the 

 island, but the specimens from both localities may prove to be 

 small plates of mica, colored by carbonate of copper. 



A white' or iridescent mineral with a metallic lustre from 

 some boulders, has been pronounced allopha?ie y but is probably 

 a hyalite* 



Ldnmontiie and pyralolite are also reported as occurring at 

 Harlem and near the Spuyten Duyveh 



From a reference to Mr. Cozzens's^book on the Geology of 

 Manhattan Island, published in 1843, it would seem that speci- 

 mens of many of the minerals above mentioned were formerly 

 found at localities now well down town,, and compactlv built 

 upon, 



