Behavior

  (1) in glass-bulb.  As native mercury, but leaves a residue of
                         pure silver.

  (2) in open tube. —­

  (3) on charcoal.  The mercury volatilizes leaving the silver,
                         which fuses to a bead, and, in the oxidizing
                         flame, incrusts the charcoal with its
                         characteristic oxide.

  (4) in forceps. —­

  (5) in borax. —­

  (6) in mic. salt. —­

  (7) with carb. soda. —­

  (8) Special reactions. —­

* * * * *

SILVER.

* * * * *

Mineral.  Native silver

Formula.  Ag.

Behavior

  (1) in glass-bulb. —­

  (2) in open tube. —­

  (3) on charcoal.  Fuses and in a strong oxidizing flame forms
                         an incrustation of dark brown oxide on the
                         charcoal.  If any antimony be present, it
                         affords a crimson incrustation.

  (4) in forceps. —­

  (5) in borax.  Gives the silver reactions.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda. —­

  (8) Special reactions. —­

* * * * *

Mineral.  Antimonial silver

Formula.  Ag^{2}Sb.

Behavior

  (1) in glass-bulb. —­

  (2) in open tube.  Gives off dense white fumes, which are
                         partly deposited in the tube.

  (3) on charcoal.  Fuses, fumes strongly, forming a white
                         incrustation, and when the antimony is
                         nearly expelled a crimson one, a nearly pure
                         silver bead remains.

  (4) in forceps. —­

  (5) in borax.  The incrustation formed on charcoal gives an
                         antimony reaction.

  (6) in mic. salt.  As in borax.

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

  (8) Special reactions. —­

* * * * *

Mineral.  Silver glance

Formula.  AgS.

Behavior

  (1) in glass-bulb. —­

  (2) in open tube.  Gives off sulphurous acid.

  (3) on charcoal.  Gives off SO^{2} and is reduced to metallic
                         silver.  If impure, a small quantity of slag
                         also remains.

  (4) in forceps. —­

  (5) in borax.  The residual slag (if any) obtained upon
                         charcoal gives an iron reaction.