arcoal. Gradually heated, turns black and fuses to a
bead, having a core of metallic copper.

(4) in forceps. Fuses but does not color the flame
distinctly. On cooling is black and
crystalline.

(5) in borax. Gives the copper reaction.

(6) in mic. salt. As in borax.

(7) with carb. soda. With much of the alkali is decomposed,
yielding metallic copper. With small
portions successively added first fuses and
then intumesces, fuses with a strong flame,
and is then absorbed into the charcoal,
leaving metallic copper.

(8) Special reactions. Gives the phosphoric acid reaction.

* * * * *

Mineral. Olivenite

Formula. [.Cu]^{4}([.....As][.....P]) + [.H].

Behavior

(1) in glass-bulb. Gives off water.

(2) in open tube. --

(3) on charcoal. Fuses with detonation and the evolution of
arsenical fumes to a brittle regulus, brown
externally and having a white fracture.

(4) in forceps. Fuses and colors the outer flame green. On
cooling has a crystalline surface.

(5) in borax. Gives the copper reaction.

(6) in mic. salt. As in borax.

(7) with carb. soda. Is reduced, yielding metallic copper.

(8) Special reactions. Gives the arsenic reactions.

* * * * *

ANTIMONY.

* * * * *

Mineral. Native antimony

Formula. Sb.

Behavior

(1) in glass-bulb. Fuses and, when strongly heated, volatilizes
being redeposited in the tube as a dark grey
sublimate.

(2) in open tube. Fuses and gives off dense white fumes, which
are partly redeposited on the tube.
Sometimes also gives off arsenical fumes in
small quantity.

(3) on charcoal. Fuses and gives off dense white fumes, which
thickly incrust the charcoal and color the
flame blue immediately beyond the assay.

(4) in forceps.