(8) Special reactions.  If fused with potassa on platinum, gives the
                         SO^{3}-reaction.

* * * * *

Mineral.  Celestine

Formula. [.Sr][...S].

Behavior

  (1) in glass-bulb. —­

  (2) in open tube. —­

  (3) on charcoal.  Fuses to a milk-white bead.

  (4) in forceps.  Colors the flame crimson.

  (5) in borax.  Gives the strontia-reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  Similar to the preceding.

  (8) Special reactions.  Similar to the preceding.

* * * * *

Mineral.  Witherite

Formula. [.Ba][..C].

Behavior

  (1) in glass-bulb.  Decrepitates more or less and evolves Water.

  (2) in open tube. —­

  (3) on charcoal.  Fuses, effervesces, and is partially absorbed by
                         the charcoal.

  (4) in forceps.  Colors the outer flame intensely green.

  (5) in borax.  Dissolves with effervescence and gives the
                         baryta-reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  Fuses to a clear bead; then spreads out and
                         passes into the charcoal.

  (8) Special reactions.  In dilute HCl dissolves with much effervescence.

* * * * *

Mineral.  Strontianite

Formula. [.Sr][..C].

Behavior

  (1) in glass-bulb.  Becomes opaque.

  (2) in open tube. —­

  (3) on charcoal.  As in the forceps.

  (4) in forceps.  Exfoliates and becomes arborescent.  The
                         filaments glow brilliantly and fuse on the
                         point.  Colors the flame brilliantly crimson.

  (5) in borax.  Resembles the preceding.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  As the preceding.

  (8) Special reactions.  As the preceding.

* * * * *

Mineral.  Barytocalcite.

Formula. [.Ba][..C] + [.Ca][..C].

Behavior

  (1) in glass-bulb.  As in the preceding.

  (2) in open tube. —­

  (3) on charcoal.  In powder frits together, but does not fuse.

  (4) in forceps.  Colors the flame green in the centre and red
                         towards the point.

  (5) in borax.  Dissolves with effervescence.  In large
                         quantities gives a semi-crystalline bead.