eft on the
surface. Laid on silver, the fused mass gives a
sulphur reaction.

(4) in forceps. Fuses easily to a clear glass, coloring the
flame yellow.

(5) in borax. Fuses easily and gives the lime reaction.

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

(7) with carb. soda. As alone in charcoal.

(8) Special reactions. As in preceding.

* * * * *

Mineral. Borax

Formula. [.Na][...B]^{2}+10[.H].

Behavior

(1) in glass-bulb. Intumesces with the evolution of water, and
under a strong heat fuses.

(2) in open tube. --

(3) on charcoal. Intumesces and fuses to a clear bead more or
less colored by impurities.

(4) in forceps. As on charcoal.

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. Fuses to a clear bead, which becomes crystalline
on cooling.

(8) Special reactions. Gives the boracic-acid-reaction.

* * * * *

Mineral. Cryolite

Formula. 3NaFl+Al^{2}Fl^{3}.

Behavior

(1) in glass-bulb. Decrepitates slightly and gives a trace of
water.

(2) in open tube. If heated so that the flame be allowed to play
up the tube upon the mineral, flourine is
evolved, which corrodes the interior of the
tube.

(3) on charcoal. Fuses to a limpid bead, which on cooling becomes
a white enamel. If heated for some time, it
bubbles, gives off fluorine and becomes
infusible.

(4) in forceps. Fuses, coloring the flame yellow.

(5) in borax. Dissolves to a clear bead, which is rendered
opaque by a large addition.

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

(7) with carb. soda. Fuses to a clear bead, then spreads out on the
charcoal, the soda is absorbed, and an infusible
mass of alumina remains.

(8) Special reactions. If the alumina residue obtained be moistened
with cobalt solution and heated strongly, it
assum