(3) on charcoal. As the preceding.

(4) in forceps. --

(5) in borax. As copper nickel.

(6) in mic. salt. Gives the nickel reaction occasionally somewhat
obscured by cobalt.

(7) with carb. soda. As the preceding.

(8) Special reactions. As copper nickel.

* * * * *

Mineral. Ulmannite

Formula. NiS^{2} + Ni(AsSb)^{2}.

Behavior

(1) in glass-bulb. Gives a slight white sublimate of SbO^{3} and
more or less AsS^{3}.

(2) in open tube. Gives off thick fumes of SbO^{3} and SbO^{5}
with AsO^{3} and SO^{2}.

(3) on charcoal. As glance cobalt, but accompanied by dense fumes
of SbO^{3}.

(4) in forceps. --

(5) in borax. As copper nickel.

(6) in mic. salt. As the preceding.

(7) with carb. soda. As the preceding.

(8) Special reactions. As copper nickel generally, but arsenic is not
always present.

* * * * *

Mineral. Cobalt pyrites

Formula. ([,Co][,Ni][,Fe]) ([,,,Co=][,,,Ni=][,,,Fe=]).

Behavior

(1) in glass-bulb. When strongly heated gives off sulphur and
becomes brown.

(2) in open tube. Gives off much SO^{2} and a small quantity of
AsO^{3}.

(3) on charcoal. In the reducing flame small fragments fuse with
the evolution of sulphur to a magnetic bead
having a bronze colored fracture.

(4) in forceps. --

(5) in borax. In the oxidizing flame on charcoal gives a
violet colored glass. In the reducing flame the
nickel is reduced and may collected in a gold
bead. When the nickel is removed, the glass
exhibits a slight iron reaction while warm.

(6) in mic. salt. As in borax, but the reduction of the nickel is
more difficult than in the latter flux.

(7) with carb. soda. As glance cobalt.

(8) Special reactions. As copper nickel, but the amount of arsenic is
usually very small.

* * * * *

Mineral. E