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PDF(2) in open tube. —
(3) on charcoal. —
(4) in forceps. V.
(5) in borax. Behaves as
magnesia. Sometimes gives a faint
iron-reaction.
(6) in mic. salt. As in borax.
(7) with carb. soda. Behaves as magnesia.
(8) Special reactions. With nitrate
of cobalt, gives the magnesia
reaction
* * * * *
Mineral. Epsomite
Formula. [.Mg][...S] + 7[.H].
Behavior
(1) in glass-bulb. Evolves water
having an acid reaction on test
paper.
(2) in open tube. —
(3) on charcoal. Gives of HO
and SO^{3}, shines brilliantly, and
becomes
alkaline and caustic.
(4) in forceps. V. As on charcoal.
(5) in borax. Behaves as magnesia.
(6) in mic. salt. As in borax.
(7) with carb. soda. The alkali
is absorbed leaving the magnesia
on
surface of the charcoal. Gives the
sulphur-reaction
on silver.
(8) Special reactions. The magnesian
residue obtained on treating with
carbonate
of soda (7), assumes a flesh-tint,
when
treated with cobalt.
* * * * *
Mineral. Boracite
Formula. [.Mg][...B]^{2} + 2[.Mg][...B].
Behavior
(1) in glass-bulb. Occasionally gives off a trace of water.
(2) in open tube. —
(3) on charcoal. Fuses with
intumescence to a white crystalline
bead.
(4) in forceps. I. As on charcoal. Colors the flame green.
(5) in borax. Fuses easily
to a clear bead, which is
crystalline,
when containing much of the
mineral,
and is usually slightly tinted by
iron.
(6) in mic. salt. As in borax.
(7) with carb. soda. With a small
quantity of alkali fuses to a clear
bead
on cooling. With a larger quantity gives a
clear,
uncrystallizable bead.
(8) Special reactions. —
* * * * *
Mineral. Magnesite
Formula. [.Mg][..C].
Behavior
(1) in glass-bulb. Sometimes gives off a small quantity of water.
(2) in open tube. —
(3) on charcoal. Is infusible.
With cobalt-solution, assumes a
dusky
flesh tint.
