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alloy ammonia antimonious acid antimony aqua regia arsenous acid assay assay-piece bead bismuth bisulphate of potassa blow-pipe boracic acid borax button Cadmium Carbonate of Soda caustic potassa charcoal chloride coating cobalt cold colorless colors the flame colors the outer compounds cooling copper crystals Ct of oxide deposited detected dissolves Division effervescence fluxes fuses readily fusible gelatinizing gives the reactions glass becomes globule of metallic gray green color heated on Ch highly saturated hydrochloric acid impart Infusible intumescence limpid glass magnet manganese mass matrass mercury metallic globule metallic lustre nickel nitric acid Occurs usually odor opaque open glass tube outer flame oxide oxide of copper oxide of zinc phosphoric platinum wire powder precipitate presence pulverized mineral Salt Sd on Ch Sesquioxide silica silver SiO3 Soluble in nitric sublimate substance sulphide sulphurous acid tellurium tellurous acid titanic acid treated vapors volatile yellowish yellowish-green zinc
Page 63 - To test the hardness of a mineral we may proceed in two different manners: firstly, by attempting to scrateh it with the minerals enumerated in the scale, successively, or, secondly, by abrasion with a file. If the file abrades the mineral under trial with the same ease as No. 4, and produces an equal depth of abrasion with the same force, its hardness is said to be 4. If with more facility than 4...
Page 42 - ... open glass tube, evolve sulphurous acid and yield a sublimate of arsenous oxide. To show in a very decisive manner the presence of arsenic in any of its combinations with sulphur, the powdered assay [No. 80] is mixed with four volumes of neutral oxalate of potassa and a little charcoal powder, or with six parts of a mixture of equal parts of cyanide of potassium and carbonate of soda, the mass introduced into a tube sealed at one end, and heat applied, at first very gently but gradually raised...
Page 62 - Scratches glass, though rather with difficulty, leaving its powder on it. Yields readily to the knife. 6. Scratches glass easily. Yields with difficulty to the knife. 7. Does not yield to the knife.
Page 62 - Chapman : 1. Yields easily to the nail. 2. Yields with difficulty to the nail, or merely receives an impression from it. Does not scratch a copper coin. 3. Scratches a copper coin; but is also scratched by it, being of about the same degree of hardness. 4. Not scratched by a copper coin ; does not scratch glass.