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The beautiful stones, amethyst, agate, chalcedony, and jasper, are all different kinds of quartz. Another chief material in rocks is a white metal called aluminium. United to oxygen it becomes alumina, the chief substance in clay. Rocks of this kind such as clays, and also the lovely blue gem, sapphire are called Argillaceous Rocks, from the Latin word for clay, and belong to the second class.
These clays, which are eaten not only in Java, but also in Sumatra, New Caledonia, Siberia, Guiana, Terra del Fuego, etc., are essentially composed of silex, alumina, and water in variable proportions, and are colored with various metallic oxides. They are in amorphous masses, are unctuous to the touch, stick to the tongue, and form a fine, smooth paste with water.
The specific gravity of it, according to Malte Brun, is 1.211, that of fresh water being 1.000. It is perfectly transparent. The applications of tests, or reagents, prove that it contains the muriatic and sulphuric acids. There is no alumina in it, nor does it appear that it is saturated with marine salt or muriate of soda.
!Answer!: 35.89% FeO; 10.03% Al O . A sample of magnesia limestone has the following composition: Silica, 3.00%; ferric oxide and alumina, 0.20%; calcium oxide, 33.10%; magnesium oxide, 20.70%; carbon dioxide, 43.00%. In manufacturing lime from the above the carbon dioxide is reduced to 3.00%. How many cubic centimeters of normal KMnO will be required to determine the calcium oxide volumetrically in a 1 gram sample of the lime?
If, from these data, it is inferred that the same substance may assume the crystalline forms of hornblende or augite indifferently, according to the more or less rapid cooling of the melted mass, it is nevertheless certain that the variety commonly called augite, and recognised by a peculiar crystalline form, has usually more lime in it, and less alumina, than that called hornblende, although the quantities of these elements do not seem to be always the same.
The floor was a surface of burning marl and whitish earthy dough-like paste, the effect of sulphurous acid vapours upon the argile of the lava. This stratum was in places more than 80 feet thick; and fumes rose fetid with sulphuric acid, and sulphates of soda, alumina, and ammonia from the dead white, purple red, vivid green, and brilliant yellow surface of the solfatara.
His experiments reveal, for example, that "coagulations" effected by different acids vary according to the fluid; thus, the addition of "alumina" to bovine amniotic fluid produced a few, fine precipitations, whereas the allantoic fluid was precipitated like urine.
We brought away some of this earth, which we took from the winter-provision of the Indians; and it is a mistake to suppose that it is steatitic, and that it contains magnesia. Vauquelin did not discover any traces of that substance in it but he found that it contained more silex than alumina, and three or four per cent of lime.
This case contains the valuable alumina known as noble corundite, and to jewellers in its formations of ruby, sapphire, and the oriental emerald, topaz, and amethyst. Herein also is the kind of corundum known as emery, and esteemed for its polishing properties.
The alkalized earths, as lime, magnesia, and still better, pot-ash, seem to intervene as solvents, for alumina, completely dissolved, acquires, as we have shown from Klaproth, a crystallization, of which, by itself, it is not susceptible.
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