A System of Instruction in the Practical Use of the Blowpipe Part 41

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(2) in open tube. --

(3) on charcoal. --

(4) in forceps. V. Exfoliates slightly.

(5) in borax. As the preceding.

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

(7) with carb. soda. As the preceding.

(8) Special reactions. --

Mineral. Psilomelane

Formula. ([.Ba],[.Ca],[.Mg],[.K]) [..Mn] + [.H].

Behavior

(1) in gla.s.s-bulb. Gives off water and, when 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 gla.s.s-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 gla.s.s-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 quant.i.ty of the alkali fuses to a black bead. With a larger quant.i.ty forms a slag.

(8) Special reactions. --

Mineral. Diallogite

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

Behavior

(1) in gla.s.s-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 of Ca.

A System of Instruction in the Practical Use of the Blowpipe Part 41

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