strongly heated, oxygen.

(2) in open tube. --

(3) on charcoal. --

(4) in forceps. V. Colors flame faintly green(Ba) and red
towards the point (Ca).

(5) in borax. As pyrolusite.

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

(7) with carb. soda. As pyrolusite.

(8) Special reactions. --

* * * * *

Mineral. Wad

Formula. [..Mn],[.Mn],[.H], also [...Fe=],[...Al=],
[.Ba],[.Cu],[...Pb],[...Si], etc.

Behavior

(1) in glass-bulb. Gives off water.

(2) in open tube. --

(3) on charcoal. --

(4) in forceps. V. Colors flame variously according to its
composition.

(5) in borax. Gives the manganese reaction, more or less
modified by the presence of other oxides.

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

(7) with carb. soda. As pyrolusite.

(8) Special reactions. Various according to composition. When strongly
heated and then moistened has an alkaline
reaction on red litmus paper.

* * * * *

Mineral. Rhodonite

Formula. [.Mn]^{3}[...Si]^{2}.

Behavior

(1) in glass-bulb. Gives off more or less water.

(2) in open tube. --

(3) on charcoal. Under a strong flame fuses to a brown opaque
bead.

(4) in forceps. II. As on charcoal.

(5) in borax. In the oxidizing flame gives the manganese
reaction. In reducing flame the iron reaction.

(6) in mic. salt. As in borax, but leaves an insoluble siliceous
skeleton.

(7) with carb. soda. With a small quantity of the alkali fuses to a
black bead. With a larger quantity forms a slag.

(8) Special reactions. --

* * * * *

Mineral. Diallogite

Formula. [.Mn][..C].

Behavior

(1) in glass-bulb. Frequently decrepitates and gives off more or
less water.

(2) in open tube. --

(3) on charcoal. If strongly heated and moistened has an alkaline
reaction on litmus paper due to the presence o