Manual of Determinative Mineralogy with an Introduction on Blowpipe AnalysisJ. Wiley, 1898 - 312 páginas |
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Términos y frases comunes
Adamantine alkaline aluminium ammonia ammonium angles antimony arsenic Atomic weight axes barium Basal bismuth Black blowpipe blue color boiling borax borax bead brown calcium carbonate on charcoal charcoal chloride Cleavage and Fracture closed tube cobalt Colorless compounds Conchoidal containing copper crystals decomposed detected Difficultly dilute dissolved DIVISION ferric filter fluorine fused Fusible fusion glass globule gray green H₂O heated Hexag hydrochloric acid hydroxide imparts insoluble intense ignition iron Isometric ivory spoonful magnesium METALLIC LUSTER MINERALS WITHOUT METALLIC moistened Monocl Na,CO Name of Species nitrate nitric acid odor open tube Orthorh oxidizing flame pale Partially Volatile Pearly phosphate Pinac Pinacoidal platinum wire potassium powdered mineral precipitate prism Prismatic pyramid reaction reducing flame Resinous rhombohedrons salt of phosphorus silica silicates silver Slowly or Partially sodium carbonate soluble specific gravity sphalerite sublimate sulphate sulphide symmetry test-tube Tetrag Triclinic Uneven violet color Vitreous yellow zinc
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Página 226 - Resinous, or having the appearance of resin, as shown by transparent varieties of sphalerite. Greasy or oily, as if the mineral had a thin coating of oil over it, as shown by some specimens of serpentine and massive quartz. Pearly, like the luster of mother-of-pearl. This is due to the interference of light in minute cracks (Newton's rings). It may usually be observed on crystal faces parallel to which there is a perfect cleavage, as on the basal planes of an apophyllite crystal. Silky, like a skein...
Página 233 - If a certain mass be weighed first in air then in water, and the weight in air divided by the loss of weight in water, the...
Página 98 - ... different kinds. Does the wood of some of them cease to burn as soon as the flame is blown out ? The wood of matches is now often " fireproofed " by impregnating* it with certain chemicals. Sodium phosphate or alum may be used for this purpose. CARBON AND ITS COMPOUNDS IN a former chapter we learned that oxygen is the most abundant element in the crust of the earth and therefore the greatest in amount in the soil. If we turn our attention to the things that live and grow in this soil, we shall...
Página 5 - ... is based on an atom of hydrogen, the lightest of all elements, as a standard (the weight of the hydrogen atom being taken as 1). The atomic weights of the common elements have been very accurately determined and are generally given with their descriptions. Molecular Weight. — The molecular weight of a substance is equal to the sum of the atomic weights of the elements constituting the molecule. Thus...
Página 33 - ... flame, and blowing a moderately strong blast of air. If a gas flame is used, it should burn from the jet e, Fig. 4, p. 13, and should be from 3 to 4 cm. high.
Página 128 - ... detection of small quantities of uranium, it is best to proceed as follows: Dissolve the mineral in hydrochloric acid (after fusion with sodium carbonate, if necessary), nearly neutralize the excess of acid with ammonia, add solid ammonium carbonate, shake vigorously, and allow the liquid to stand a few minutes. The uranium is at first precipitated, but is soluble in excess of ammonium carbonate, and by filtering may be separated from a great many elements which are precipitated by that reagent....
Página 93 - This is pale yellow when hot and almost white when cold. This oxide is volatile in the oxidizing flame, but if touched for an instant with a moderately hot reducing flame it assumes a beautiful ultramarine-blue color.
Página 122 - TeO:, which passes up the tube as a white smoke, but mostly condenses near the heated part as a white sublimate. On heating the latter, It volatilizes very slowly and fuses Into globules, which are yellow when hot, and white or colorless when cold. Heated in the closed tube, tellurium volatilizes and condenses on the hot glass as fused globules having a metallic luster. Accompanying the tellurium are white or colorless globules of the oxide, Ted, formed from the oxidation, due to the air in the tube.
Página 26 - A variety of minerals are decomposed by fusion with potassium bisulphate, and such fusions may be made either in the platinum spoon, porcelain crucible, or often even in a testtube. Potassium Bisulphate and Fluorite. — The finely pulverized materials, mixed in the proportion of 3 parts of the former to 1 of the latter, are useful for detecting boron in some of its combinations, and it is well to have a small supply of the mixture on hand. The mixture when heated liberates hydrofluoric acid. 2HKSO.
Página 102 - H,PtCl,, which should be evaporated nearly to dryness, at a moderate heat, treated with hydrochloric acid, and again evaporated. It should be finally taken up with a little water, filtered if necessary, and added to a concentrated solution of ammonium chloride, when a yellow precipitate of ammonium platinic chloride, (NH4),PtCl,r will be thrown down.