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PDF(4) in forceps. As the preceding.
(5) in borax. Gives the
lead reaction and occasionally a
slight
iron and manganese reaction.
(6) in mic. salt. As in borax.
(7) with carb. soda. Is reduced
yielding a metallic lead bead. The
fused
alkaline mass gives a sulphur reaction on
silver.
(8) Special reactions. —
* * * * *
Mineral. Pyromorphite
Formula. PbCl + 3[.Pb]^{3}[.....P].
Behavior
(1) in glass-bulb. Decrepitates,
and when strongly heated for some
time,
gives a slight white sublimate of PbCl.
(2) in open tube. —
(3) on charcoal. In oxidizing
flame fuses to a bead having a
crystalline
surface on cooling, and forms a thin
film
of PbCl on the charcoal In reducing flame
fuses
without reduction and on cooling assumes a
polyhedral
form. Incrusts the charcoal slightly
with
PbO.
(4) in forceps. Fuses and colors the flame blue.
(5) in borax. —
(6) in mic. salt. —
(7) with carb. soda. Is reduced
yielding a metallic bead and
incrusting
the charcoal with PbO.
(8) Special reactions. Gives the
chlorine reaction with microcosmic
salt
and CuO. Also the phosphoric acid
reactions.
* * * * *
Mineral. Mimetene
Formula. PbCl+ 3[.Pb]^{3}[.....As]
Behavior
(1) in glass-bulb. As the preceding.
(2) in open tube. —
(3) on charcoal. Fuses, but
less easily than the preceding, gives
off
AsO^{3} and incrusts the charcoal with
PbCl.
Finally is reduced to a metallic bead and
forms
an incrustation of PbO.
(4) in forceps. As the preceding.
(5) in borax. The oxide
formed on charcoal gives the lead
reactions.
(6) in mic. salt. As in borax.
(7) with carb. soda. As the preceding.
(8) Special reactions. Gives the chlorine reaction.
* * * * *
Mineral. Vanadinite
Formula. PbCl + 3[.Pb]^{3}[...V]?
Behavior
(1) in glass-bulb. As pyromorphite.
(2) in open tube. —
