A System of Instruction in the Practical Use of the Blowpipe - LightNovelsOnl.com
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(4) in forceps. --
(5) in borax. The roasted mineral gives a zinc reaction, and sometimes a slight iron reaction.
(6) in mic. salt. As in borax.
(7) with carb. soda. As alone on charcoal. Moreover colors the flame blue. The fused alkali gives a S reaction on silver.
(8) Special reactions. --
Mineral. Red oxide of zinc
Formula. [.Zn].
Behavior
(1) in gla.s.s-bulb. --
(2) in open tube. --
(3) on charcoal. In the reducing flame forms a thin incrustation of oxide of zinc on the charcoal.
(4) in forceps. V.
(5) in borax. Generally gives a manganese and slight iron reaction in addition to that of zinc.
(6) in mic. salt. As in borax.
(7) with carb. soda. On charcoal, forms a thick incrustation of ZnO.
(8) Special reactions. With carbonate of soda and nitre on platinum foil gives manganese reaction.
Mineral. Electric calamine
Formula. 2[.Zn]^{3}[...Si] + 3[.H]
Behavior
(1) in gla.s.s-bulb. Gives off water and becomes white and opaque.
(2) in open tube. --
(3) on charcoal. --
(4) in forceps. V.
(5) in borax. Dissolves to a clear gla.s.s, which cannot be rendered opaque by the intermittent flame.
(6) in mic. salt. Dissolves to a clear gla.s.s, which becomes opaque on cooling. Silica remains insoluble.
(7) with carb. soda. With carbonate of soda alone is infusible. With 2 parts of alkali and 1 of borax fuses to a gla.s.s and sets free [.Zn], which incrusts the charcoal.
(8) Special reactions. --
Mineral. Calamine
Formula. [.Zn][..C].
Behavior
(1) in gla.s.s-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.
BIs.m.u.tH.
Mineral. Native bis.m.u.th
Formula. Bi.
Behavior
(1) in gla.s.s-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.
