294 METALS. 



It occurs in Massachusetts, at the Southampton lead mines, 

 at Turner'* Falls on the Connecticut, at Hatfield and Ster- 

 ling ; in \ ermont, at Strafford, where it was for a time 

 worked, and at Shrewsbury, Corinth, Waterbury ; in New 

 Hampshire, at Franconia, Shelburn, Unity, Warren, Eaton, 

 Lyme, Haverhill ; in Maine, at the Lubec lead mines, and 

 Dexter ; in New York, at the Ancram lead mine, also near 

 Rossie, and at Wurtzboro ; in Pennsylvania, at Morgantown ; 

 •n Virginia, at the Phenix copper mines, Fauquier county, 

 tnd at the Walton gold mine, Luzerne county ; in Maryland, 

 in the vicinity of Liberty and New London, in Frederick 

 Co., and at the Patapsco mines, near Sykesville ; in North 

 Carolina, in Davidson and Guilford counties. In Michigan, 

 where native copper is so abundant, this is a rare ore ; but 

 It occurs at Presqu'isle, at Mineral Point, and in Wisconsin, 

 where it is the predominating ore. In Tennessee, in Polk 

 county, at the Hiwassee mines, where, however, only the 

 overlying black copper is worked. 



Uses. This ore, besides being mined for copper, is ex- 

 tensively employed in the manufacture of blue vitriol (sul- 

 phate of copper,) in the same manner that sulphate of iron 

 (copperas) is obtained from iron pyrites. 



Cuban is a sulphuret of copper and iron, containing sulphur 39*0, 

 iron 380, copper 19-8, silica 2'3=99-l2. 



ERUBESCITE. VARIEGATED COPPER PYRITES. 



Monometric. Cleavage octahedral, in traces. Occurs in 

 cubes and octahedrons. Also massive. 



Color between copper-red and pinchbeck-brown. Tar- 

 nishes rapidly on exposure. Streak pale grayish-black and 

 but slightly shining. Brittle. H=3. Gr=5. 



Composition : specimen from Bristol, Conn., sulphur 25*7, 

 copper 62*8, iron 11*6. Fuses before the blowpipe to a 

 globule attractable by the magnet. On charcoal affords 

 fumes of sulphur. Mostly dissolved in nitric acid. 



Dif. This ore is distinguished from the preceding by its 

 pale reddish-yellow color. 



Obs. Occurs with other copper ores, in granitic and al- 

 lied rocks, and also in secondary formations. The mines 

 of Cornwall have afforded crystallized specimens, and it is 

 there called from its color " horse-flesh ore." Other foreign 



What is the appearance and composition of variegated copper py« 

 rites 1 How is it distinguished from the preceding species ] 

 24 



