(5) in borax.  Gives the copper reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  With much of the alkali is decomposed,
                         yielding metallic copper.  With small
                         portions successively added first fuses and
                         then intumesces, fuses with a strong flame,
                         and is then absorbed into the charcoal,
                         leaving metallic copper.

  (8) Special reactions.  Gives the phosphoric acid reaction.

* * * * *

Mineral.  Olivenite

Formula.                 [.Cu]^{4}([.....As][.....P]) + [.H].

Behavior

  (1) in glass-bulb.  Gives off water.

  (2) in open tube. —­

  (3) on charcoal.  Fuses with detonation and the evolution of
                         arsenical fumes to a brittle regulus, brown
                         externally and having a white fracture.

  (4) in forceps.  Fuses and colors the outer flame green.  On
                         cooling has a crystalline surface.

  (5) in borax.  Gives the copper reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  Is reduced, yielding metallic copper.

  (8) Special reactions.  Gives the arsenic reactions.

* * * * *

ANTIMONY.

* * * * *

Mineral.  Native antimony

Formula.  Sb.

Behavior

  (1) in glass-bulb.  Fuses and, when strongly heated, volatilizes
                         being redeposited in the tube as a dark grey
                         sublimate.

  (2) in open tube.  Fuses and gives off dense white fumes, which
                         are partly redeposited on the tube. 
                         Sometimes also gives off arsenical fumes in
                         small quantity.

  (3) on charcoal.  Fuses and gives off dense white fumes, which
                         thickly incrust the charcoal and color the
                         flame blue immediately beyond the assay.

  (4) in forceps. —­

  (5) in borax.  The oxide formed upon charcoal gives the
                         antimony reactions.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda. —­

  (8) Special reactions.  The incrustation on the charcoal, if treated
                         with nitrate of cobalt assumes the
                         characteristic green color.

* * * * *

Mineral.  Grey antimony

Formula.  SbS^{3}.