COBALT AND NICKEL. 165 
O23. From Joachimstahl, Przibram, Riechelsdorf ; Sax- 
ony ; Cornwall ; at the Sterling Mine, Antwerp, N. Y.; at 
the Gap Mine, Lancaster Co., Pa.; at St. Louis, Mo., in 
capillary forms, and sometimes wool-like, in cavities in mag- 
nesian limestone. A valuable ore of nickel. 
Beyrichite has the formula Ni, §.,. 
Smailtite.—Cobalt Glance. Chloanthite. 
Isometric. Occurs in octahedrons, cubes, and dodecahe- 
drons, and other forms. See tigs. 1, 2, 3, page 17, and 17, 27, 
page 20. Cleavage octahedral, somewhat distinct. Also 
reticulated ; often massive. 
Color tin-white, sometimes inclining to steel-gray. Streak 
grayish black. Brittle. Fracture granular and uneven. 
H.=5°5-6. G.=6°4-7°2. 
Composition. (Co, Ni) As, ; the ore being either a cobalt 
arsenide, or cobalt-nickel arsenide ; and graduating into the 
nickel arsenide called Chloanthite. ‘The cobalt in the ore 
may constitute 23°5 per cent. ; but it may be wholly absent 
as in the chloanthite. In addition, iron often replaces part 
of the other metals, as in the variety Safforite. 
In the closed tube gives a sublimate of metallic arsenic ; 
in the open tube a white sublimate of arsenous oxide, and 
sometimes traces of sulphurous acid. B.B. on charcoal, 
affords an arsenical odor, fuses to a globule which gives re- 
action for iron, cobalt, and nickel. 
Diff. Arsenopyrite (mispickel) has tho white coor of 
smaltite, but it yields sulphur as well as arsenic, and in a 
closed tube affords arsenic sulphide, orpiment and realgar. 
Obs. Usually in veins with ores of cobalt, silver, and 
copper. Occurs in Saxony, especially at Schneeberg ; also 
in Bohemia, Hessia, and Cornwall. 
In the United States it is found in gneiss with copper 
nickel (niccolite), at Chatham, Conn. 
Cobalitite. 
Isometric. Crystals like those of pyrite, but silver-white 
in color with a tinge of red, or inclined to steel-gray. Streak 
eravich black. Brittle. H.=5-5. .Gr==6-63. 
Composition. CoS,+Co As,=Co AsS= Arsenic 45:2, sul- 
phur 19°3, cobalt 35°55=100, but often with much iron 
and occasionally a little copper. Unaltered in the closed 
