Part 44 (2/2)

(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.

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