on charcoal. Intumesces and become infusible.

(4) in forceps. V. Colors the flame violet if a potassa
alum--yellow if soda--be present.

(5) in borax. Dissolves and gives the iron and manganese
reaction, if these oxides be present. Otherwise
the bead is colorless.

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

(7) with carb. soda. The alkali is absorbed into the charcoal,
leaving an infusable mass which gives the sulfur
reaction on silver.

(8) Special reactions. If not containing too much iron or manganese
gives an alumina reaction with nitrate of of
cobalt. In other respects as the preceding.

* * * * *

Mineral. Turquoise

Formula. [...Al=]^{2}[.....P] + 5[.H].

Behavior

(1) in glass-bulb. Evolves water, occasionally decrepitates and
turns black.

(2) in open tube. --

(3) on charcoal. Turns brown, but remains infusible.

(4) in forceps. V. As on charcoal. Colors the outer flame green.

(5) in borax. In the oxidizing flame, gives a green bead, due
to copper and iron. In reducing flame, opaque red.

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

(7) with carb. soda. Intumesces, then fuses to a semi-clear glass
colored by iron. With more alkali yields an
infusible mass.

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

* * * * *

Mineral. Wavellite

Formula. [Al=]F^{3} + 3([...Al=]^{4}[.....P]^{3} + 18[.H].)

Behavior

(1) in glass-bulb. Evolves water and some fluorine, which attacks
the glass.

(2) in open tube. --

(3) on charcoal. Exfoliates and turns white.

(4) in forceps. V. As on charcoal. Colors the outer flame green,
especially if moistened with SO^{3}.

(5) in borax. As alumina. Generally gives also a slight iron
reaction.

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

(7) with carb. soda. Forms an infusible white mass.

(8) Special reactions. With cobalt-solution on charcoal gives the