The Elements of Blowpipe Analysis

by Frederick Hutton Getman

Atacamite, CuCl₂ + 3 CuO₂H₂—Cl . 16.6, O . 20.3, Cu . 50.1, H₂O . 13.0.—

H = 3.0-3.5, G = 3.75-3.77.

Color, green to blackish green. Lustre, adamantine to vitreous. In an ignition tube yields water. Before the Bp. on Ch. colors flame blue. Before the Bp. on Ch. with Na₂CO₃ and KCN is reduced to the metal. In borax bead it reacts for copper.

Ores of Iron

Limonite, 2 Fe₂O₃ + 3 H₂O, Fe₂O₃ . 86, H₂O . 14.—H = 5.0-5.5, G = 3.6-4.0. Color, brown to ochre-yellow. Earthy or semi-metallic in appearance. In an ignition tube yields water. Before the Bp. on Ch. infusible. In borax bead reacts for iron.

Hematite, Fe₂O₃, Fe . 70, O . 30.—

H = 5.5-6.5, G = 4.9-5.3.

Color, dark steel-gray to iron-black. Lustre, metallic. When pulverized yields a red powder. Before the Bp. on Ch. infusible. After long roasting becomes magnetic. In borax bead gives usual indications of iron.

Magnetite, Fe₃O₄, FeO . 31, Fe₂O₃ . 69.—

H = 5.5-6.5, G = 5.17-5.18.