reducing flame red.

(4) in forceps. V. Colors the outer flame intensely green.

(5) in borax. Gives the copper reactions.

(6) in mic. salt. As with borax. The silica remains
undissolved.

(7) with carb. soda. With a small quantity of carbonate of soda
fuses to a bead, which on cooling is opaque
and has a red fracture. With more alkali
forms a slag, containing little beads of
reduced copper.

(8) Special reactions. --

* * * * *

Mineral. Malachite

Formula. [.Cu]^{2}[..C] + [.H].

Behavior

(1) in glass-bulb. Gives off water and turns black.

(2) in open tube. --

(3) on charcoal. Fuses to a bead with a strong flame is
reduced to metallic copper.

(4) in forceps. Fuses and colors the outer flame brilliantly
green.

(5) in borax. Gives the copper reaction.

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

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

(8) Special reactions. Dissolves in HCl with much effervescence.

* * * * *

Mineral. Blue vitriol

Formula. [.Cu][...S] + 5[.H].

Behavior

(1) in glass-bulb. Intumesces, gives off water and becomes
white.

(2) in open tube. Strongly heated is decomposed, given off
SO^{2} and being converted into CuO.

(3) on charcoal. As in the glass-bulb. Then fuses, coloring
the outer flame green, and is reduced to
metallic copper and [,Cu=].

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

(5) in borax. The roasted mineral gives copper reaction.

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

(7) with carb. soda. Yields metallic copper. The alkaline mass
laid on silver gives S reaction.

(8) Special reactions. Gives the sulphuric acid reaction.

* * * * *

Mineral. Libethenite

Formula. [.Cu]^{4}[.....P] + 2[.H].

Behavior

(1) in glass-bulb. Gives off water and turns black.

(2) in open tube. --

(3) on ch