182 NEW YORK STATE MUSEUM 



Duane, FranJclin co. An extensive bed of massive pyrite occurs 

 in this town near the road leading to Malone. 



Martinsburg^ Leivis co. Crystallized pyrite in the form of 

 modified octahedrons occurs in a vein of galena which traverses 

 the limestone. 



Schoharie, Schoharie co. Pyrite in well crystallized forms, sin- 

 gle or in clusters, occurs in the limestone about 1 mile west of 

 the courthouse. 



Rossie, Si Lawrence co. At the Rossie lead mines, which for- 

 merly produced considerable galena, large, brilliant and highly 

 modified crystals of pyrite were obtained. These mines, how- 

 ever, have been abandoned for so long that it is difficult at 

 present to obtain even cabinet specimens. 



Eighteen Mile creek, Erie co. On the shore of Lake Erie near 

 Eighteen Mile creek, pyrite occurs quite abundantly in the slate. 



Marcasite, the white iron pyrites, do not occur to any extent 

 in jN'ew York State, though small crystals have been found in 

 the cement mines at Rondout, Ulster co. 



2 Arsenical pyrites. Two compounds of arsenic and iron are 

 here included: a sulpharsenid of iron known as arsenopyrite or 

 mispickel and a diarsenid of iron of somewhat variable com- 

 poisition known as lollingite or leucopyrite. Both minerals are 

 used to a limited extent in the manufacture of white arsenic. 

 Owing ito their brilliant, white, metallic color, they are often 

 mistaken for silver ores, but, though the arsenopyrite of New 

 South Wales frequently carries gold, precious metal has never 

 been extracted from arsenical pyrites in this section of the 

 United States. The principal New York localities follow. 



Edenville, Orange co. Both arsenopyrite and lollingite occur 

 in this locality; the former in both crystallized and massive 

 varieties associated with gypsum and orpiment and embedded in 

 white limestone; and the latter distributed throughout a black 

 hornblendic diorite. 



Kent and Boyd's Corners, Putnam co. This locality lies about 

 4 miles northwest of Carmel near Brown's quarry, a serpentine 

 deposit which was formerly worked. 



