(8) Special reactions. --

* * * * *

Mineral. Calamine

Formula. [.Zn][..C].

Behavior

(1) in glass-bulb. Gives off CO^{2} and becomes opaque.

(2) in open tube. --

(3) on charcoal. As the red oxide. Sometimes also gives a lead
incrustation.

(4) in forceps. V.

(5) in borax. Gives a zinc reaction and frequently an iron and
manganese reaction.

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

(7) with carb. soda. Forms a thick incrustation of zinc, sometimes
also of [.Pb] and [.Co].

(8) Special reactions. Dissolves with much effervescence in cold acid.

* * * * *

BISMUTH.

* * * * *

Mineral. Native bismuth

Formula. Bi.

Behavior

(1) in glass-bulb. --

(2) in open tube. Fuses and is converted into a yellow oxide.

(3) on charcoal. Fuses to a bead and incrusts the charcoal with
oxide.

(4) in forceps. --

(5) in borax. The oxide formed upon charcoal gives the bismuth
reactions.

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

(7) with carb. soda. --

(8) Special reactions. --

* * * * *

Mineral. Bismuthine

Formula. BiS.

Behavior

(1) in glass-bulb. --

(2) in open tube. Fuses with ebullition and gives of S and SO^{2}.

(3) on charcoal. Fuses with much spirting and in the reducing
flame yields a metallic bead and incrusts the
charcoal with oxide.

(4) in forceps. --

(5) in borax. The oxide obtained upon charcoal gives the
bismuth reactions.

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

(7) with carb. soda. As alone on charcoal. The fused alkali gives the
sulphur reaction on silver.

(8) Special reactions. --

* * * * *

Mineral. Bismuthblende

Formula. [...Bi=]^{2}[...Si]^{3}.

Behavior

(1) in glass-bulb. Turns yellow and, when strongly heated, fuses.

(2) in open tube. --

(3) on charcoal. Fu