A System of Instruction in the Practical Use of the Blowpipe Part 44

(5) in borax. In the oxidizing flame on charcoal gives a violet colored gla.s.s. In the reducing flame the nickel is reduced and may collected in a gold bead. When the nickel is removed, the gla.s.s exhibits a slight iron reaction while warm.

(6) in mic. salt. As in borax, but the reduction of the nickel is more difficult than in the latter flux.

(7) with carb. soda. As glance cobalt.

(8) Special reactions. As copper nickel, but the amount of a.r.s.enic is usually very small.

Mineral. Emerald nickel

Formula. [.Ni]^{3}[..C] + 6[.H].

Behavior

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

(2) in open tube. --

(3) on charcoal. --

(4) in forceps. --

(5) in borax. Dissolves with much effervescence and gives the nickel reaction.

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

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

(8) Special reactions. In warm dilute HCl dissolves with much effervescence.

Mineral. Cobalt Bloom

Formula. [.Co]^{3}[.....As] + 8[.H].

Behavior

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

(2) in open tube. --

(3) on charcoal. Evolves a.r.s.enical fumes and in the reducing flame fuses to a dark grey bead of a.r.s.enide of cobalt.

(4) in forceps. In the point of the blue flame fuses and colors the outer flame blue (As).

(5) in borax. Gives the cobalt reaction.

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

(7) with carb. soda. --

(8) Special reactions. Gives off a.r.s.enic with cyanide of pota.s.sium in gla.s.s tube.

Mineral. Earthy cobalt

Formula. [.Mn],[.Co],[.Cu],[.Fe],[.H], etc.

Behavior

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

(2) in open tube. --

(3) on charcoal. Emits a slight smell of a.r.s.enic, but does not fuse.

(4) in forceps. Colors the flame blue.

(5) in borax. In oxidizing flame gives the cobalt reaction which obscures those of [.Mn], [.Cu], etc. In reducing flame occasionally gives the [.Cu]

reaction.

(6) in mic. salt. As in borax. If a saturated bead be treated on charcoal with tin in the reducing flame for a few seconds, the [.Cu] reaction is sometimes obtained.

(7) with carb. soda. Forms an infusible ma.s.s.

(8) Special reactions. With carbonate of soda and nitre on platinum foil, gives a strong manganese reaction.

ZINC.

Mineral. Zincblende

Formula. ZnS.

Behavior

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

(2) in open tube. Evolves SO and becomes white or yellow if containing iron.

(3) on charcoal. V. In the reducing flame incrusts the charcoal with ZnO; also with CdO, if that metal be present.