be. --

(3) on charcoal. Fuses to a bead incrusting the charcoal with
PbO. The bead on cooling is crystalline and has
a dark metallic surface.

(4) in forceps. As pyromorphite.

(5) in borax. Dissolves to a clear colorless glass, which in
the reducing flame becomes yellow, and on
cooling grey and opaque.

(6) in mic. salt. Dissolves to a clear colorless glass, which
in the reducing flame assumes a dusky blue
color. After a time becomes opaque.

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

(8) Special reactions. With carbonate of soda and nitre gives the
manganese reaction.

* * * * *

COPPER.

* * * * *

Mineral. Native Copper

Formula. Cu.

Behavior

(1) in glass-bulb. --

(2) in open tube. --

(3) on charcoal. Fuses to a brilliant metallic bead, which on
cooling becomes covered with a coating of black
oxide.

(4) in forceps. Fuses and colors the outer flame blue.

(5) in borax. In the oxidizing flame dissolves and then gives
the copper reactions.

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

(7) with carb. soda. --

(8) Special reactions. --

* * * * *

Mineral. Vitreous Copper

Formula. Cu^{2}S.

Behavior

(1) in glass-bulb. --

(2) in open tube. Evolves SO^{2} and, when pulverized and gently
heated for some time is converted into CuO.

(3) on charcoal. Fuses to a bead, which spirts considerably and
gives off SO^{2}. When pulverized and gently
roasted, is converted into CuO.

(4) in forceps. --

(5) in borax. The roasted mineral gives the copper reaction,
and sometimes also a slight iron-reaction.

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

(7) with carb. soda. In the reducing flame is decomposed, forming NaS
and metallic copper. If the former be cut out
and laid upon silver, it gives the