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.

(4) in forceps. --

(5) in borax. Behaves as magnesia. Sometimes a slight
iron-reaction.

(6) in mic. salt. As in borax.

(7) with carb. soda. Fuses to a bead, the soda is then absorbed,
leaving an infusable mass of magnesia.

(8) Special reactions. The magnesian residue obtained by fusing with
carbonate of soda gives the magnesian-reaction
with nitrate of cobalt. Dissolves with
effervescence in warm HCl.

* * * * *

Mineral. Mesitine spar

Formula. ([.Mg][.Fe][.Mn])[..C].

Behavior

(1) in glass-bulb. As magnesite.

(2)