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PDF (4) in forceps. Fuses to a
translucent violet colored bead, the
color
being due to cobalt. Colors the flame blue
at
first, then faintly red.
(5) in borax. Dissolves
readily to a bead strongly colored by
cobalt,
which obscures the lime-reaction.
(6) in mic. salt. As in borax.
(7) with carb. soda. Fuses, and
emits As. The alkali is then absorbed
by
the charcoal, as in the preceding.
(8) Special reactions. —
* * * * *
Mineral. Calespar
Formula. [.Ca][..C].
Behavior
(1) in glass-bulb. Turns white
and sometimes decrepitates. Strongly
heated
loses CO^{2} and becomes caustic.
(2) in open tube. —
(3) on charcoal. Turns white,
or brown if containing much iron or
manganese
and glows brilliantly.
(4) in forceps. Glows brilliantly,
coloring the flame red.
Becomes
caustic and shows a strong alkaline
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.
