(4) in forceps.  I. In reducing flame is magnetic.

  (5) in borax.  Gives the iron reaction.

  (6) in mic. salt.  Gives the iron and silica reactions.

  (7) with carb. soda.  Fuses to a black opaque bead.

  (8) Special reactions.  Generally gives the manganese reaction with
                         nitre and carbonate of soda.

* * * * *

Mineral.  Chloropal

Formula. [...Fe=][...Si]^{2} + 3[.H].

Behavior

  (1) in glass-bulb.  Decrepitates more or less, gives off much water
                         and turns black.

  (2) in open tube. —­

  (3) on charcoal. —­

  (4) in forceps.  V. Loses color and turns black.

  (5) in borax.  Gives the iron reaction.

  (6) in mic. salt.  Gives the iron and silica reaction.

  (7) with carb. soda.  Fuses to a transparent green glass.

  (8) Special reactions. —­

* * * * *

Mineral.  Green earth

Formula. [...Si],[.Fe],[...Al=],[.Na],[.K],[.H], etc.

Behavior

  (1) in glass-bulb.  Gives off water and becomes darker in color.

  (2) in open tube. —­

  (3) on charcoal. —­

  (4) in forceps.  V. In reducing flame fuses on edges and colors
                         the outer flame yellow ([.Na]) or violet ([.K]).

  (5) in borax.  As the preceding.

  (6) in mic. salt.  As the preceding.

  (7) with carb. soda.  Forms a slaggy mass.

  (8) Special reactions. —­

* * * * *

Mineral.  Siderite

Formula. [.Fe][..C].

Behavior

  (1) in glass-bulb.  Occasionally decrepitates.  Gives off CO^{2} and
                         turns black and magnetic.

  (2) in open tube. —­

  (3) on charcoal.  As in glass bulb.

  (4) in forceps.  Behaves similarly to the magnetic oxide.

  (5) in borax.  Gives the iron and manganese reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  Behaves as an oxide.  With nitre and carbonate of
                         soda on platinum generally gives the manganese
                         reaction.

  (8) Special reactions.  In acid dissolves with effervescense.

* * * * *

Mineral.  Copperas

Formula. [.Fe][...S] + 7[.H].

Behavior

  (1) in glass-bulb.  Gives off water, and, when strongly heated,
                         SO^{2} and SO^{3}, which reddens litmus paper.