3 to 4 times its volume of [.K],[...S]^{2} it
forms a fluid yellow mass having an orange color
when cold.

* * * * *

Mineral. Crocoisite

Formula. [.Pb][...Cr].

Behavior

(1) in glass-bulb. Decrepitates violently and assumes a dark color.

(2) in open tube. --

(3) on charcoal. Fuses and detonates yielding Cr^{2}O^{3} and
metallic lead, and forming an incrustation of
PbO on the charcoal.

(4) in forceps. As pyromorphite.

(5) in borax. Dissolves readily and colors the glass yellow
while warm, and green when cold. (See Chromium
reaction.)

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

(7) with carb. soda. On platinum foil gives a dark yellow mass, which
becomes paler on cooling. On charcoal yields a
metallic button.

(8) Special reactions. Treated as above with [.K],[...S]^{2} forms a
violet colored mass, which on solidifying
becomes reddish and on cooling pale grey.

* * * * *

Mineral. Molybdate of lead

Formula. [.Pb][...M].

Behavior

(1) in glass-bulb. As the preceding.

(2) in open tube. --

(3) on charcoal. Fuses and is partly absorbed into the charcoal
leaving a globule of metallic lead, which is
partially oxidized and incrusts the charcoal.

(4) in forceps. As pyromorphite.

(5) in borax. Dissolves readily and gives the molybdena
reaction.

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

(7) with carb. soda. Yields metallic lead.

(8) Special reactions. Fused as above with [.K],[...S]^{2} forms a yellow mass,
which becomes white on cooling. If this be
dissolved in water and a piece of zinc
introduced into the solution, the latter becomes
blue.

* * * * *

Mineral. Scheeletine

Formula. [.Pb][...W].

Behavior

(1) in glass-bulb. Decrepitates more or less.

(2) in open tu