Print
Word
PDF (3) on charcoal. Fuses and
is partly absorbed into the charcoal
leaving
a globule of metallic lead, which is
partially
oxidized and incrusts the charcoal.
(4) in forceps. As pyromorphite.
(5) in borax. Dissolves
readily and gives the molybdena
reaction.
(6) in mic. salt. As in borax.
(7) with carb. soda. Yields metallic lead.
(8) Special reactions. Fused as above
with [.K],[...S]^{2} forms a yellow mass,
which
becomes white on cooling. If this be
dissolved
in water and a piece of zinc
introduced
into the solution, the latter becomes
blue.
* * * * *
Mineral. Scheeletine
Formula. [.Pb][...W].
Behavior
(1) in glass-bulb. Decrepitates more or less.
(2) in open tube. —
(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
