A System of Instruction in the Practical Use of the Blowpipe Part 39

Behavior

(1) in gla.s.s-bulb. Occasionally decrepitates. Gives off CO^{2} and turns black and magnetic.

(2) in open tube. --

(3) on charcoal. As in gla.s.s bulb.

(4) in forceps. Behaves similarly to the magnetic oxide.

(5) in borax. Gives the iron and manganese reaction.

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

(7) with carb. soda. Behaves as an oxide. With nitre and carbonate of soda on platinum generally gives the manganese reaction.

(8) Special reactions. In acid dissolves with effervescense.

Mineral. Copperas

Formula. [.Fe][...S] + 7[.H].

Behavior

(1) in gla.s.s-bulb. Gives off water, and, when strongly heated, SO^{2} and SO^{3}, which reddens litmus paper.

(2) in open tube. Evolves water and SO^{2}, which may be recognized by its odor.

(3) on charcoal. Loses water and SO^{2}, and is converted into [...Fe=].

(4) in forceps. Gives off H and SO^{2}, and then behaves as the magnetic oxide.

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

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

(7) with carb. soda. Forms sulphide of sodium and oxide of iron. The former is absorbed into the charcoal, and if cut out and laid upon silver and moistened gives the S reaction.

(8) Special reactions. If dissolved in water, and a strip of silver-foil be introduced into the solution, the metal remains untarnished.

Mineral. Vivianite

Formula. [.Fe]^{3}[.....P] + 8[.H].

Behavior

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

(2) in open tube. --

(3) on charcoal. Froths up and then fuses to a grey metallic bead.

(4) in forceps. As on charcoal. Singes flame green ([.....P]).

(5) in borax. Gives the iron reaction.

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

(7) with carb. soda. In reducing flame becomes magnetic and fuses to a black saggy ma.s.s.

(8) Special reactions. --

Mineral. Iriphyline

Formula. ([.Fe][.Mn][.Li])^{3}[.....P].

Behavior

(1) in gla.s.s-bulb. Gives off water, having an alkaline reaction, and a.s.sumes a metallic l.u.s.tre resembling graphite.

(2) in open tube. --

(3) on charcoal. Fuses readily to a black magnetic bead with a metallic l.u.s.tre.

(4) in forceps. I. On platinum wire colors the flame crimson ([.Li]) and green ([.....P]), towards the point fuses to a black magnetic bead.

(5) in borax. Gives the iron and manganese reactions.

(6) in mic. salt. Gives the iron reaction which overpowers that of the manganese.

(7) with carb. soda. Forms an infusible porous ma.s.s, which under the reducing flame becomes magnetic.

(8) Special reactions. Gives the manganese reaction with nitre and carbonate of soda on platinum foil.

Mineral. Scorodite

Formula. [...Fe=][.....As] + 4[.H].

Behavior

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