424 



DESCRIPTIVE MINERALOGY. 



Erie County. According to Mr. Vanuxem, minute quantities of copper pyrites are found 

 at Black-Rock, and elsewhere in this county. By decomposition, it gives rise to stains of the 

 green carbonate of copper. 



Herkimer County. Near Salisbury comers, the excavations in the calciferous sandstone 

 have furnished small specimens of copper pyrites, with those of iron pyrites, zinc blende and 

 galena.* It is almost impossible, however, to obtain specimens at the present time. 



Jefferson County. Minute specimens of this ore of copper were, a few years since, 

 found on the banks of Muscolunge lake in the town of Alexandria. 



Niagara County. Small particles of copper pyrites and green carbonate of copper occur 

 in the grey band at Lewiston ;t and it is also said to have been found in Oneida county. 



Orange County. Copper pyrites is found in small quantities, associated with the arsenical 

 minerals which occur near the village of Edenville. It is also found at the O'Neil iron mine 

 in the town of Monroe. 



Putnam County. In the gneiss rock at the Phillips iron mine, eight miles northeast of 

 Coldspring landing, small masses of pyritous and green carbonate of copper are occasionally 

 found with iron pyrites. 



St. Lawrence County. This mineral occurs at several localities in this county. One of 

 these is about five miles from Rossie, beyond De Long's mill. Several tons were raised at 

 this mine in searching for a bed of iron ore, and it has been thought to be a rich vein. Ano- 

 ther occurs near Canton, where the ore is found in thin beds, apparently between the layers 

 of limestone, nearly in a horizontal direction. These ores yield about twelve per cent, of 



metallic copper.f 



At the Rossie lead mine, specimens of 



crystallized copper pyrites have been found 

 in the galena. They exhibit trihedral termi- 

 nations, a little rounded like some crystals 

 of calcareous spar. Also the forms repre- 

 sented in Figs. 506 and 507, of which the 

 latter is a twin, composed of about equal 

 parts of an octahedron, one half of which is 

 turned half round. P on P' 125° 30' ; I on 

 I' 71° 10'. 

 This mineral occurs in considerable abundance, associated with galena 

 and zinc blende, at the mine near Wurtzborough. It is found both 

 crystallized and massive. It has a beautiful tarnish, and is sometimes 

 coated with green carbonate of copper. The crystals are in the form 

 of the octahedron with the modification represented in Fig. 508, but 

 they are seldom perfect. P on c 140° 30'. The gangue is quartz, 

 which is both massive and crystallized. 



Fig. 507. 



Sullivan County. 



Fig. 508. 



* Vanuxem. New-York Geological Reports, 1838. 



t Hall. Ibid. 1838. 



t Emmons. Ibid. 1838. 



