A System of Instruction in the Practical Use of the Blowpipe Part 35

URANIUM.

Mineral. Pitchblende

Formula. [.U][...U=] essentially.

Behavior

(1) in gla.s.s-bulb. Evolves some water and a small quant.i.ty of sulphur, sulphide of a.r.s.enic and metallic a.r.s.enic.

(2) in open tube. Evolves SO^{2} and a white sublimate of a.r.s.enious acid.

(3) on charcoal. Gives off a.r.s.enical fumes.

(4) in forceps. III. Colors the flame blue beyond the a.s.say, owing to the presence of Pb. Sometimes also green towards the point, due to Cu.

(5) in borax. The roasted mineral affords the uranium reaction.

(6) in mic. salt. As borax. Also a small residue of silica.

(7) with carb. soda. Infusible. Affords the characteristic Pb incrustation, and sometimes yields minute particles of Cu.

(8) Special reactions. --

Mineral. Uranium ochre

Formula.

[...U=][.H]^{2}.

Behavior

(1) in gla.s.s-bulb. Evolves water and a.s.sumes a red color.

(2) in open tube. --

(3) on charcoal. V. In reducing flame a.s.sumes a green color.

(4) in forceps. --

(5) in borax. Gives the uranium reaction.

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

(7) with carb. soda. --

(8) Special reactions. --

Mineral. Uranite

Formula. ([.Ca] +[...U=]^{2})[.....]P + 8[.H].

Behavior

(1) in gla.s.s-bulb. Evolves water and becomes yellow and opaque.

(2) in open tube. --

(3) on charcoal. Fuses with intumescence to a black bead having a semi-crystalline surface.

(4) in forceps. --

(5) in borax. Gives the uranium reaction.

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

(7) with carb. soda. Forms an infusible yellow slag.

(8) Special reactions. Gives the PO^{5} reaction.

Mineral. Chalcolite

Formula. ([.Cu]+[...U=]^{2})[.....P] + 8[.H].

Behavior

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

(2) in open tube. --

(3) on charcoal. As uranite.

(4) in forceps. As uranite.

(5) in borax. In the oxidizing flame gives a green bead, which in the reducing flame becomes of an opaque red, from Cu.

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

(7) with carb. soda. In reducing flame yields a metallic bead of Cu.

(8) Special reactions. As uranite.