(8) Special reactions. —­

* * * * *

Mineral.  Minium

Formula.  Pb^{3}O^{4}.

Behavior

  (1) in glass-bulb. —­

  (2) in open tube. —­

  (3) on charcoal.  Is reduced first to litharge (PbO) and then to
                         metallic lead which forms the usual
                         incrustation.

  (4) in forceps.  Colors the outer flame blue.

  (5) in borax.  Gives the lead reactions.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  As alone on charcoal.

  (8) Special reactions. —­

* * * * *

Mineral.  Mendipite

Formula.  PbCl + 2PbO.

Behavior

  (1) in glass-bulb.  Decrepitates slightly and assumes a yellow
                         color.

  (2) in open tube. —­

  (3) on charcoal.  Fuses readily and is reduced to metallic lead
                         with the evolution of acid fumes.  Forms a white
                         incrustation of PbCl, and a yellow one of PbO.

  (4) in forceps.  As the preceding.

  (5) in borax.  As the preceding.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  As alone on charcoal.

  (8) Special reactions.  Gives the chlorine reaction with CuO and
                         microcosmic salt.

* * * * *

Mineral.  Cerusite

Formula. [.Pb][..C].

Behavior

  (1) in glass-bulb.  Decrepitates, gives off CO^{2}, turns yellow and
                         fuses.

  (2) in open tube. —­

  (3) on charcoal.  Is reduced to metallic lead, incrusting the
                         charcoal around with PbO.

  (4) in forceps.  As the preceding.

  (5) in borax.  Gives the lead reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  As alone on charcoal.

  (8) Special reactions.  In nitric acid dissolves with much
                         effervescence.

* * * * *

Mineral.  Anglesite

Formula. [.Pb][...S].

Behavior

  (1) in glass-bulb.  Decrepitates and gives off a small quantity of
                         water.

  (2) in open tube. —­

  (3) on charcoal.  In the oxidizing flame fuses to a clear bead,
                         which becomes opaque on cooling.  In reducing
                         flame is reduced with much ebullition to a
                         metallic bead and incrusts the charcoal around
                         with PbO.