zinc. 155 



which resemble garnet, are distinguished by the same char- 

 aracters and also by their very difficult fusibility. 



Obs. Occurs in rocks of all ages, and is associated gener- 

 ally with ores of lead ; often also with copper, iron, tin, and 

 silver ores. The lead mines of Missouri and Wisconsin afford 

 this ore abundantly. Other localities are in Maine, at Lu- 

 bec, Bingham, Dexter, Parsonsfield ; in New Hampshire, 

 at Eaton, Warren, Haverhill, Shelburne ; in Vermont, at 

 Hatfield ; in Connecticut, in Brookfield, Berlin, Roxbury, 

 and Monroe ; in New York, at Ancram lead mine, the 

 Wurtzboro' lead vein, at Lockport, Eoot, 2 miles southeast 

 of Spraker's Basin, in Fowler, at Clinton ; at Franklin, N. 

 J., colorless (Cleiopliane) ; in Pennsylvania, at the Perkio- 

 men lead mine ; in Virginia, at Austin's lead mine, W^ythe 

 County; in Tennessee, near Powell's River, and at Haysboro'; 

 at Prince's Mine, Spar Island, Lake Superior, with ores of sil- 

 ver ; in Beauce Co., Canada, where it is slightly auriferous. 



This ore is the Black-jack of miners. 



Blende is a useful ore of zinc, though more difficult of re- 

 duction than calamine. By its decomposition (like that of 

 pyrite), it aifords sulphate of zinc or white vitriol. 



Wurtzite is zinc sulphide in hexagonal crystals from Bolivia. Hucts- 

 colite and Youngite are zinc-lead sulphides. 



Zincite. — Red Zinc Ore. Red Zinc Oxide. 



Hexagonal. Usually in foliated masses, or in disseminated 

 grains ; cleavage eminent, nearly like that of mica ; but the 

 laminae brittle, and not so easily separable. 



Color deep or bright red ; streak orange-yellow. Lustre 

 brilliant, subadamantine. Translucent or subtranslucent. 

 H.=:4-4*5. Gr. =5 -4-5*7. Thin scales by transmitted light 

 deep yellow. 



Composition. Zn = Oxygen 19-7, zinc 80*3 = 100. B.B. 

 infusible alone, but yields a yellow transparent glass with 

 borax ; on charcoal, a coating of zinc oxide. Dissolves in 

 nitric acid without effervescence. 



Biff. Resembles red stilbite, but distinguished by its in- 

 fusibility and also by its mineral associations. 



Obs. Occurs witli franklinite at Mine Hill and Sterling 

 Hill, Sussex County, N. J. 



A good ore of zinc, and easily reduced. 



Voltzite. A compound of sulphur, oxygen and zinc, 4 Zn S +Zn O. 

 Occurs in implanted globules of a dirty rose-red color, with a pearly 

 lustre on a cleavage surface. From France, and near Joachimstahl. 



