reaction.

(5) in borax. Dissolves with evolution of CO^{2} and when pure
gives the lime-reaction. The bead is generally
more or less colored by iron and manganese.

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

(7) with carb. soda. Fuses, and behaves as other lime-salts.

(8) Special reactions. Dissolves with effervescence in cold HCl.

* * * * *

Mineral. Fluorspar

Formula. CaFl

Behavior

(1) in glass-bulb. Phosphoresces with various colors, when heated
in the dark.

(2) in open tube. --

(3) on charcoal. Fuses easily to a clear bead, which becomes opaque
on cooling, then loses fluorine, glows brilliantly
and becomes infusible.

(4) in forceps. As on charcoal. Colors the flame red.

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

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

(7) with carb. soda. Fuses to a clear bead, opaque on cooling. With
an addition of the alkali behaves as lime.

(8) Special reactions. With microcosmic salt in open tube gives the
fluorine-reaction.

* * * * *

MAGNESIA.

* * * * *

Mineral. Brucite

Formula. [.Mg][.H].

Behavior

(1) in glass-bulb. Evolves water.

(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.