(3) on charcoal.  Fuses to a magnetic bead black on the surface,
                         and with a yellow shining fracture.

  (4) in forceps. —­

  (5) in borax.  As iron pyrites.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  As iron pyrites.

  (8) Special reactions. —­

* * * * *

Mineral.  Mispickel

Formula.  FeAs + FeS^{2}.

Behavior

  (1) in glass-bulb.  A red sublimate of AsS^{2} is first formed and
                         then a black sublimate of metallic arsenic.

  (2) in open tube.  Sulphurous and arsenious acids are evolved, the
                         latter forming a white sublimate.

  (3) on charcoal.  Gives off much arsenic forming a white
                         incrustation and fuses to a magnetic globule.

  (4) in forceps. —­

  (5) in borax.  As iron pyrites.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  As iron pyrites.

  (8) Special reactions. —­

* * * * *

Mineral.  Magnetic iron ore

Formula.  Fe^{3}O^{4}

Behavior

  (1) in glass-bulb. —­

  (2) in open tube. —­

  (3) on charcoal. —­

  (4) in forceps.  In the blue flame, fuses on edges and remains
                         magnetic.

  (5) in borax.  Gives the iron reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda. —­

  (8) Special reactions. —­

* * * * *

Mineral.  Specular iron
                         Red haematite

Formula.  Fe^{2}O^{3}

Behavior

  (1) in glass-bulb. —­

  (2) in open tube. —­

  (3) on charcoal. —­

  (4) in forceps.  V. In the blue flame is converted into
                         Fe^{2}O^{4}, and then behaves as the preceding.

  (5) in borax.  As magnetic iron ore.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda. —­

  (8) Special reactions. —­

* * * * *

Mineral.  Goethite

Formula. [...Fe][.H].

Behavior

  (1) in glass-bulb.  Evolves water.

  (2) in open tube. —­

  (3) on charcoal. —­

  (4) in forceps.  As specular iron.

  (5) in borax.  As specular iron.

  (6) in mic. salt.  As in borax.