A System of Instruction in the Practical Use of the Blowpipe Part 48

(5) in borax. As the preceding.

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

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

(8) Special reactions. Gives the chlorine reaction with CuO and microcosmic salt.

Mineral. Cerusite

Formula. [.Pb][..C].

Behavior

(1) in gla.s.s-bulb. Decrepitates, gives off CO^{2}, turns yellow and fuses.

(2) in open tube. --

(3) on charcoal. Is reduced to metallic lead, incrusting the charcoal around with PbO.

(4) in forceps. As the preceding.

(5) in borax. Gives the lead reaction.

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

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

(8) Special reactions. In nitric acid dissolves with much effervescence.

Mineral. Anglesite

Formula. [.Pb][...S].

Behavior

(1) in gla.s.s-bulb. Decrepitates and gives off a small quant.i.ty of water.

(2) in open tube. --

(3) on charcoal. In the oxidizing flame fuses to a clear bead, which becomes opaque on cooling. In reducing flame is reduced with much ebullition to a metallic bead and incrusts the charcoal around with PbO.

(4) in forceps. As the preceding.

(5) in borax. Gives the lead reaction and occasionally a slight iron and manganese reaction.

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

(7) with carb. soda. Is reduced yielding a metallic lead bead. The fused alkaline ma.s.s gives a sulphur reaction on silver.

(8) Special reactions. --

Mineral. Pyromorphite

Formula. PbCl + 3[.Pb]^{3}[.....P].

Behavior

(1) in gla.s.s-bulb. Decrepitates, and when strongly heated for some time, gives a slight white sublimate of PbCl.

(2) in open tube. --

(3) on charcoal. In oxidizing flame fuses to a bead having a crystalline surface on cooling, and forms a thin film of PbCl on the charcoal In reducing flame fuses without reduction and on cooling a.s.sumes a polyhedral form. Incrusts the charcoal slightly with PbO.

(4) in forceps. Fuses and colors the flame blue.

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. Is reduced yielding a metallic bead and incrusting the charcoal with PbO.

(8) Special reactions. Gives the chlorine reaction with microcosmic salt and CuO. Also the phosphoric acid reactions.

Mineral. Mimetene

Formula. PbCl+ 3[.Pb]^{3}[.....As]

Behavior

(1) in gla.s.s-bulb. As the preceding.

(2) in open tube. --

(3) on charcoal. Fuses, but less easily than the preceding, gives off AsO^{3} and incrusts the charcoal with PbCl. Finally is reduced to a metallic bead and forms an incrustation of PbO.

(4) in forceps. As the preceding.

(5) in borax. The oxide formed on charcoal gives the lead reactions.

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