lue.

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. As on charcoal, except that the S combines
with the alkali forming NaS, which on silver
gives the sulphur reaction.

(8) Special reactions. --

* * * * *

Mineral. Orpiment

Formula. AsS^{3}.

Behavior

(1) in glass-bulb. As the preceding, except that the sublimate
is of a dark yellow color when cold.

(2) in open tube. As the preceding.

(3) on charcoal. As the preceding.

(4) in forceps. As the preceding.

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. As the preceding.

(8) Special reactions. --

* * * * *

Mineral. White arsenic

Formula. AsO^{3}.

Behavior

(1) in glass-bulb. Sublimes without fusion and re-condenses in
white crystals.

(2) in open tube. --

(3) on charcoal. Sublimes and is partly recondensed on
charcoal forming a white incrustation.

(4) in forceps. Colors the flame blue.

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. --

(8) Special reactions. Heated with charcoal in a glass-tube sealed
at one end, is reduced and metallic arsenic
sublimes.

* * * * *

MERCURY.

* * * * *

Mineral. Native mercury

Formula. Hg.

Behavior

(1) in glass-bulb. Volatilizes with little or no residue and
recondenses in neck of bulb.

(2) in open tube. --

(3) on charcoal. Is volatilized.

(4) in forceps. --

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. --

(8) Special reactions. --

* * * * *

Mineral. Cinnabar

Formula. HgS.

Behavior

(1) in glass-bulb. Volatilizes sometimes leaving a slight
earthy residue, and re-condenses as a black
sulphide.

(2) in open tube. If gently heated is decomposed into metall