A System of Instruction in the Practical Use of the Blowpipe Part 40

(2) in open tube. Gives off water and AsO^{3}.

(3) on charcoal. Emits a.r.s.enical fume and in the reducing flame fuses to a magnetic ma.s.s having a metallic l.u.s.tre.

(4) in forceps. I. As on charcoal. Colors the outer flame blue.

(5) in borax. The roasted mineral gives an iron reaction.

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

(7) with carb. soda. As alone on charcoal.

(8) Special reactions. Gives the a.r.s.enic reactions.

Mineral. Cube ore

Formula. [.Fe]^{3}[.....As] + [...Fe=]^{3}[.....As]^{2} + 18[.H].

Behavior

(1) in gla.s.s-bulb. Evolves much water.

(2) in open tube. As the preceding.

(3) on charcoal. As the preceding.

(4) in forceps. As the preceding.

(5) in borax. As the preceding.

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

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

(8) Special reactions. As the preceding.

MANGANESE.

Mineral. Manganblende

Formula. MnS.

Behavior

(1) in gla.s.s-bulb. --

(2) in open tube. Gives off SO^{2} and becomes greyish green on surface.

(3) on charcoal. Is slowly roasted and converted into oxide.

(4) in forceps. V.

(5) in borax. The roasted mineral gives a strong manganese reaction.

(6) in mic. salt. In the unroasted state, dissolves with much ebullition and detonation due to elimination of sulphide of phosphorus. The bead then exhibits the characteristic violet color of manganese.

(7) with carb. soda. Forms a slaggy ma.s.s, which laid on silver and moistened, gives the sulphur reaction.

(8) Special reactions. --

Mineral. Pyrolusite

Formula. [..Mn].

Behavior

(1) in gla.s.s-bulb. Frequently gives off a small quant.i.ty of water and, when strongly heated, oxygen.

(2) in open tube. --

(3) on charcoal. --

(4) in forceps. V.

(5) in borax. Gives the manganese reaction.

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

(7) with carb. soda. Forms a slaggy ma.s.s.

(8) Special reactions. --

Mineral. Manganite

Formula. [...Mn=][.H].

Behavior

(1) in gla.s.s-bulb. Gives off much water.