IR()\ ORES. 235 



it giving fire with steel ; it differs also in yielding a mag- 

 netic globule before the blowpipe and in not affording the 

 reaction of cobalt with the fluxes. 



Obs. Mispickel is found mostly in primitive regions, and 

 is commonly associated with ores of silver, lead, iron, or 

 copper. It is abundant at Freiberg, Munzig, and elsewhere 

 in Europe, and also in Cornwall, England. 



It occurs in crystals in New Hampshire, at Franconia, 

 Jackson, and Haverhill ; in Maine, at Blue Hill, Corinn 

 Newfield, and Thomaston ; in Vermont, at Waterbury ; i 

 Massachusetts, massive at Worcester and Sterling ; in Con 

 necticut, at jCJbtathamij Derby, and Monroe ; in New Jersey, 

 at Franklin ; in New York, in Lewis, Essex county, and near 

 Edenville and elsewhere in Orange county ; in Kent, Put- 

 nam county. 



Leucopyrite. This is the name of an arsenical iron, containining no 

 Bulphur, or but few per cent. It resembles the preceding in color and 

 in its crystals ; M : M=122° 26'. It has less hardness and higher spe- 

 cific gravity. H=5 — 55. Gr=72 — 7*4. Contains iron 32 4, ar- 

 senic 65*9, with some sulphur. From Styria, Silesia, and Carinthia. A 

 crystal weighing two or three ounces has been found in Bedford county, 

 Penn. ; and in Randolph county, N. C, a mass was found weighing two 

 pounds. 



magnetite. — Octahedral Iron Ore. 



Monometric. Often in octahedrons and dodecahedrons, 

 Cleavage octahedral ; sometimes 

 distinct. Also granularly mas- 

 sive 



Color iron-black. Streak black. 

 Brittle. H= 5-5— 6-5. Gr== 

 5*0 — 5*1. Strongly attracted by 

 the magnet, and sometimes having polarity. 



Composition: peroxyd of iron 09, protoxyd of iron 31 ; or 

 iron 72*4, oxygen 27*6. Infusible before the blowpipe. 

 Yields a bottle-green glass when fused with borax in the 

 inner flame. 



Dif. The black streak and magnetic properties distin- 

 guish this species from the following. 



What are the constituents of mispickel? What is the effect before 

 he blowpipe? How does it differ from arsenical cobalt? What ia 

 he crystallization of magnetic iron ? its other physical characters ! us 

 omposition ? What is the action of magnetic iron before the blowpipe \ 

 low is it distinguished from specular iron ? 



