MINERAL RESOURCES OF THE STATE OF NEW YORK 29 



A mixed sample of the high and low grade ores was analyzed by 

 H. F. Gardner of the Museum staff with the following results : 



SiOz 



26.84 



AI2OS 





Ca 



Mg 



Nil 



P2O5 



• 05 



S 



25.07 



Fe 



28.83 



As 



18.51 



Cu 



.16 



Mn 



tr 



Co 



Nil 



Ni 



Nil 



99-73 



The figures indicate a mineral composition of 40.20 per cent 

 arsenopyrite, 32.31 per cent pyrite and .39 per cent chalcopyrite. 



An analysis of the dike, which has also been reported by 

 the Company, is sufficiently interesting to deserve record. It estab- 

 lishes the ultra-basic nature of the rock and is in agreement with 

 the view above expressed that it is an altered peridotite. 



SiOj 



35-50 



AI2O3 



4-52 



FejOa 



7.40 



CaO 



2.60 



MgO 



37-64 



C02\ 





H2O/ 



13-30 



100.96 



Leucopyrite, arsenopyrite and scorodite are reported^ to occur 

 at Edenville, Orange county. According to Whitlock^ arsenop3aite 

 is found here in association with gypsum and orpiment, embedded 

 in white limestone; while leucopyrite is distributed through a 

 dioritic rock. A prospect in which considerable work has been 

 done is located on the Brown farm between Edenville and Mt Adam. 

 Arsenopyrite is also listed in the report by Beck already cited as 

 occurring in the town of Lewis, Essex county, 10 miles south of 

 Keeseville. 



Most of the arsenic of commerce is now obtained as a by- 

 product of smelting operations in which the arsenious oxide (white 

 arsenic) is recovered from the smslter fumes, at relatively small 

 cost. Consequently the ores of arsenic are of less interest than 

 formerly. 



1 Beck. Mineralogy of New York (1842). 



2 Whitlock. N. Y. State Mus. 23d Rep't of State Geologist, 1903. 



