234 METALS. 



grayish-black. Brittle. H=35— 4*5. Gr=4«4— 4-65 

 Slightly attracted by the magnet. Liable to speedy tarnish. 



Composition: sulphur 39*5 iron 60'5. Before the blow- 

 pipe on charcoal in the outer flame it is converted into a glo- 

 bule of red oxyd of iron. In the inner flame it fuses and 

 glows, and affords a black globule which is magnetic, and has 

 a yellowish color on a surface of fracture. 



Dif. Its inferior hardness and shade of color, and its 

 magnetic quality distinguish it from common iron pyrites ; and 

 its paleness of color from copper pyrites. It differs from the 

 cobalt and nickel ores in affording a magnetic globule before 

 the blowpipe. 



Obs. Crystallized specimens have been found at Kongs- 

 berg in Norway, and at Andreasberg in the Hartz. The 

 massive variety is found in Cornwall, Saxony, Siberia, and 

 the Hartz ; also at Vesuvius and in meteoric stones. 



In the United States, it is met with at Trumbull and Mon- 

 roe, New Fairfield, and Litchfield, Conn. ; at Strafford and 

 Shrewsbury, Vt. ; at Corinth, New Hampshire ; and in 

 many parts of Massachusetts and New York. This ore at 

 Litchfield is quite abundant. 



Uses. Same as for common pyrites. 



^?^)EK0PXW»w IISPICKEL * — Arsenical Iron Pyrites. 



Trimetric. In rhombic prisms, with cleavage parallel to 

 the faces M ; M : M=11P 40' to 112°. Crystals y<\ 

 sometimes elongated horizontally, producing a / \\ 

 rhombic prism of 100° nearly, with M and M the M 

 end planes. Occurs also massive. I 



Color silver-white ; streak dark grayish-black. \ S 



Luster shining. Brittle. H=5-5— 6. Gr=6«3. \|X 



Composition: iron 34'4, arsenic 46*0, sulphur 19'6. A 

 cobaltic variety contains 4 to 9 per cent, of cobalt in place 

 of part of the iron. The Danaite of New Hampshire, con- 

 sists of iron 32*9, arsenic 41*4, sulphur 17*8, cobalt 6*5. 

 Affords arsenical fumes before the blowpipe, and a globule 

 of sulphuret of iron which is attracted by the magnet. It 

 gives fire with a steel and emits a garlic odor. 



Dif. Resembles arsenical cobalt ; but is much harder, 



What is the constitution of magnetic pyrites? How is it distinguish- 

 ed from common iron pyrites ? how from copper pyrites ? frcm cobalt 

 and nickel ores. For what is it used ? What is the form and appear- 

 ance of mispickel 1 



