IRON. 175 
magnetic quality distinguish it from pyrite; and its pale- 
ness of color from chalcopyrite or copper pyrites. 
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, 16 1s met with at Trumbull and 
Monroe, New Fairfield, and Litchfield, Conn. ; at Strafford 
and Shrewsbury, Vt.; at Corinth, New Hampshire; in 
many parts of Massachusetts and New York; at Lancaster, 
Pa., where it is worked for nickel. It is used for making 
green vitriol and sulphuric acid, like pyrite. 
Troilite is a similar mineral of the formula FeS, oceur- 
ring in meteorites. Schreibersite is a phosphide of iron and 
nickel, occurring in meteorites. 
Arsenopyrite.—Mispickel. Arsenical Iron Pyrites. 
Trimetric. In rhombic prisms, with cleavage parallel to 
the faces [; JA/=111° 40’ to 112°. 
Crystals sometimes elongated horizon- 
tally, producing a rhombic prism of ee 
100° nearly, with J and J the end 
planes. Occurs also massive. ae 
Color  silver-white; streak dark [ I 
grayish-black. Lustre shining. Brit- | 
tle. -H.=5°5-6. G.=6°3. ae ft Na aa 
Composition. Ke AsS= Arsenic 46:0, 
sulphur 19-6, iron 84:°4=100. A co- 
baltic variety contains 4 to 9 per cent. of cobalt in place 
of part of. the iron; Danaite of New Hampshire, consists 
of Arsenic 41°4, sulphur -8,,1ron 32-05 cobalt: 6-55 7 Bb: 
affords arsenical fumes, and a slobule of iron sulphide 
which is attracted by the magnet. In the closed tube a 
sublimate of arsenic sulphide. Gives fire with a steel and 
emits a garlic odor. 
Diff. Resembles arsenical cobalt, but is much harder, 
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. Arsenopyrite is found mostly in crystalline rocks, and 
is commonly associated with ores of silver, lead, iron, or cop- 
per. It is abundant at Freiberg, Munzig, and elsewhere in 
Europe, and also in Cornwall, England. 

