130 TRANSACTIONS OF THE [APR. 11, 



Daniel S. Martin, Chairman. 

 Joel A. Allen, 

 Nathaniel L. Britton, 

 Herman L. Faircliild, 

 John J. Stevenson. 



Dr. J. J. Friedrich exhibited a variety of minerals, and 

 read 



NOTES ON LOCAL MINERALOGY. 



Kalinite, a potassa alum with distinct styptic alum taste, 

 occurs as an ingredient of a soft mica schist, which is also rich 

 in fine scales of molybdenite, in a well-kown molybdenite local- 

 ity, in First Avenue, between Forty-third and Forty-fourth 

 Streets. Some specimens show well-preserved incrustations. 

 Molybdite is also found there. 



In an excavation in Forty-third Street, between Third and 

 Second Avenues, I found several specimens of fine crystals of 

 calcite, the faces of which are coated with minute cubes of iron 

 pyrite, jH-oducing a beautiful iridescent effect. These specimens 

 contain also crystals of galenite, smoky quartz, and a peculiar 

 yellow crystalline calcite. Galenite has formerly been found, 

 as I was told by contractors, in the tunnelling of the eastern 

 outlet of Forty-second Street. In the same quarry, which 

 abounds in giant gneiss and smoky quartz, I found a fine beryl 

 with a peculiar banded appearance. 



Black serpentine occurs in contact with albite and calcite in 

 Ninety-sixth Street, between Lexington and Third Avenues. 

 From the same locality I have some specimens of amianthus. 



The excavation in One Hundredth Street, between Tliird and 

 Lexington Avenues, so rich in magnetite, basin its upper schists, 

 which are characterized by pyroxenites and prochlorite, abundant 

 traces of ilmenite and rutile. 



I have from this locality some specimens, containing reddish 

 translucent crystals, which do not resemble rutile, but seem 

 rather to be a magnesium sphene or greenovite. 



Dr. Charles B. Warring read a paper 



