OOArnUSTIRLE MINERALS, NOT GASEOUS. 187 



is said to be a mixture of talc and grapliitc, well suited for some of the uses to which this 

 mineral is applied.* 



Essex County. There is a vein of graphite at Rogers' rock, from whicli tolerable cabinet 

 specimens may l)e ol)taiiied ; and a locality of tlic massive variety has Ixjcn fomid near Port 

 Henrj', but its extent and value are still unknown. 



Putnam County. This mineral, largely mixed, however, witli foreign matters, is found 

 associated with arsenical pj'rites, near Brown's serpentine quarry, three and a half miles 

 northwest of the village of Carmel. 



Orange County. Interesting specimens of graphite occur in the white limestone at Duck 

 Cedar pond, in the town of Monroe. The jilatcs, which are often six-sided or rounded, are 

 stellar and radiated, resembling in their structure certain specimens of prehnite. 



New-York County. In the vicinity of the city, graphite has been noticed as occurring in 

 hcxahcdral prisms about four-tenths of an inch long, and sometimes truncated on their terminal 

 edges. The ganguc is a brownish oxide of iron, embracing hornblende and mica.t 



Washigton County. A small vein of graphite occurs in the limestone about a mde and a 

 lialf from Fort- Ann, on the road to Whitehall. It is associated with rounded grains of quartz, 

 pyroxene and other minerals.! 



Artificial Cirapliitc. A kind of graphite is artificially formed during the reduction of the 

 ores of iron. I have found it in the hearth of a furnace at Southficld in Orange county, and 

 at Kossic in .St. Lawrence county. At the former, the magnetic, and at the latter, the specu- 

 lar, iron ore, is employed. The specimen from Southfield has the colour and lustre of gra- 

 phite. It usually breaks with a small conchoidal fracture. It is tougher and harder than 

 graphite, but every where, when broken, has the same lustre and gives the same trace as that 

 mineral. According to my anah^sis, it is composed of 20.39 carbon and 70.01 iron. On 

 the supposition that this substance contains an atom of each of these constituents, the ratio 

 would be 17.65 carbon and S2 .3.5 iron. One of these artificial compounds, examined by 

 Berthier,§ consisted of 0. 1S3 carbon and 0.819 iron, the proportions being <piitc near to those 

 in the specimen which I analyzed. 



It is known that compounds of carbon and iron in other proportions are thus artificially 

 formed ; and sometimes nearly pure graphite is also the result. 



* Matlmr. A'-ii>York Gmlngim! Rip iris, 1838, J Miiihor. jXrw-Vurk (kiilof;icaI Rrporls, 19.|1. 



t Ilaiiy. Ckavdaiul\s Mhienilii^i/. ^ Trake tks Essciis par la Voic S'xht^, If, 210. 



