A Manual of Blow Pipe Analysis Electronic Resource And Determinative Mineralog
A Manual of Blow Pipe Analysis Electronic Resource And Determinative Mineralog
William Elderhorst
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On Ch in Fl blackens, in R Fl turns red. S Ph and Bx dissolve it with the usual indica- tions of copper ; the S Ph bead shows a cloud of undissolved silica. With Sd on Ch, affords globules of metallic copper. It is decomposed by acids, silica remaining undissolved. ORES OF GOLD, PLATINUM, AND IRIDIUM. Native Gold. 150. Combination of Au and Ag in variable proportions, some- times with traces of Fe and Cu. H=2. 5 3. G= 15. 6 19. 5. BLOW-PIPE ANALYSIS. 75 Easily distinguished by its malleability,... its cutting like lead, its high specific gravity, and its resistance to acids. Color and streak various shades of gold-yellow. It usually occurs in variously con- torted and branched filaments, in scales, in plates, or in small irregular masses. On Ch, fuses to a globule which, after cooling, has a bright metallic surface. With SPh in OF1, a bead is formed which opalizes on cooling, or becomes opaque and yellow, according to the amount of silver which it contains. Resists the action of heated concentrated nitric acid ; soluble only in aqua regia.
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