%1V 



often also 1 or 2 per cent, of sulphuret of cadmium, espe 

 cially t he red variety. J Infusible alone and with borax 

 Dissolves in n.iirk' aciil, emitting sulphuretted hydrogen 

 j - Strongly heated on charcoal yields fumes of zinc. 

 I Dif. This ore is characterized by its waxy luster, per- 

 L^Je.ct cleavage, and infusibility.l Some dark varieties look a 

 little like tin ore, but their cleavage and inferior hardness 

 distinguish them ; and some clear red crystals which re- 

 semble garnet are distinguished by the same characters and 

 also by their infusibility. \ 



Obs. Occurs in rocks of all agesj, and is associated gen- 

 erally with ores of lead ; often also with copper, iron, tin, 

 and silver ores. * The lead mines of Missouri and Wiscon- 

 sin, afford this ore abundantly. Other localities are in 

 Maine, at Lubec, Bingham, Dexter, Parsonsfield ; in New 

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

 Vermont, at Thetford ; in Massachusetts, at Sterling, South- 

 ampton, and Hatfield ; in Connecticut, at Brookfield, Berlin, 

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

 mine, the Wurtzboro lead vein, at Lockport, Root, 2 miles 

 s. e. of Spraker's basin, in Fowler, at Clinton ; in Pennsyl- 

 vania, at the Perkiomen lead mine ; in Virginia, at Austin's 

 lead mine, Wythe county ; in Tennesse, near Powell's River, 

 and at Haysboro. 



• This ore is, the Black Jack of miners. 

 I Uses. Blende is a useful ore of zinc, though more diffi- 

 cult of reduction than calamine. By its decomposition, 

 (like that of pyrites,) it affords sulphate of zinc or white 

 vitriol. 



zincite.— hed zinc ore. — Red oxyd of zinc. 



Tri metric. 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. Luster 

 brilliant, subadamantine. Translucent or subtranslucent. 

 [1=4 — 45. Gr=5'4 — 5-56. Thin scales by transmitted 

 light deep yellow. 



Composition : zinc 80*3, oxygen 19'7=100. Infusible 



What is the action of zinc blende before the blowpip-e ? How is it dis- 

 tinguished '< How does it occur? What is the appearance of red zinc 

 ore 1 its composition 1 



