United States Congressional Serial SetU.S. Government Printing Office, 1908 Reports, Documents, and Journals of the U.S. Senate and House of Representatives. |
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Sayfa 11
... derived chiefly from the first , in great part through the transforming agency of waters and of the atmosphere , although organic life has had some share in bringing about certain of the changes . In addi- tion to the substances which ...
... derived chiefly from the first , in great part through the transforming agency of waters and of the atmosphere , although organic life has had some share in bringing about certain of the changes . In addi- tion to the substances which ...
Sayfa 15
... derived therefrom . Cerium exists in a considerable number of mineral species , but the phosphate , monazite , and the silicates , cerite and allanite , are all that need be mentioned here . Chlorine . The most abundant element of the ...
... derived therefrom . Cerium exists in a considerable number of mineral species , but the phosphate , monazite , and the silicates , cerite and allanite , are all that need be mentioned here . Chlorine . The most abundant element of the ...
Sayfa 16
... derived . Found also in the aluminate , chrysoberyl ; in several rare silicates and phosphates ; and in a borate , hambergite . As a rule the minerals of glucinum occur in granitic rocks . Gold . Found in nature as the free metal and in ...
... derived . Found also in the aluminate , chrysoberyl ; in several rare silicates and phosphates ; and in a borate , hambergite . As a rule the minerals of glucinum occur in granitic rocks . Gold . Found in nature as the free metal and in ...
Sayfa 18
... derived substances as coal . Nitrates are found in the soil and in cave earth ; and in some arid regions , as in Chile , they exist in enormous quantities . Some volcanic waters contain nitrogen in the form of ammonium compounds ...
... derived substances as coal . Nitrates are found in the soil and in cave earth ; and in some arid regions , as in Chile , they exist in enormous quantities . Some volcanic waters contain nitrogen in the form of ammonium compounds ...
Sayfa 20
... derived from them . Out of 800 igneous rocks analyzed in the laboratory of the United States Geological Survey , 784 contained titanium . Its commonest occur- rences are as titanite , ilmenite , rutile , and perofskite . The element is ...
... derived from them . Out of 800 igneous rocks analyzed in the laboratory of the United States Geological Survey , 784 contained titanium . Its commonest occur- rences are as titanite , ilmenite , rutile , and perofskite . The element is ...
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Diğer baskılar - Tümünü görüntüle
Sık kullanılan terimler ve kelime öbekleri
acid alkaline analcite analyses anorthite apatite atmosphere augite average beam biotite Bull calcium carbonate carbon dioxide cement cent Chem chemical chloride cited clay coal composition compounds Compt concrete constituents contain copper corundum crystals cubic cylinders decomposition deposits derived described dissolved dolomite epidote feldspar ferric formed fused gases Geological Survey Gesell granite heated Hillebrand hornblende hydrogen hydrogen sulphide idem igneous rocks inches iron Jour Kryst laboratory Lake leucite limestone magma magnesium magnetite material metals metamorphism mica minerals Mitth mixture molds Molecular muscovite nephelite Neues Jahrb ocean olivine organic matter origin orthoclase oxide oxygen phosphates plagioclase potassium Proc proportions pyrite pyroxene quartz reactions Rend Rept River saline salts sand schist sea water sedimentary shown in Pl silicates SiO2 sodium soluble solution species Specific gravity substances sulphate sulphide sulphur temperature test pieces tion trace trace U. S. Geol United States Geological volcanic weight Zeitschr
Popüler pasajlar
Sayfa 8 - All tests shall be made in accordance with the methods proposed by the Committee on Uniform Tests of Cement...
Sayfa 17 - A third pat is exposed in any convenient way in an atmosphere of steam, above boiling water, in a loosely closed vessel for five hours.
Sayfa 279 - Levy' repeatedly obtained hematite from artificial magmas, and similar observations have been made by others. In ordinary furnace slags, however, according to JHL Vogt, » hematite rarely if ever occurs. Ferric oxide can crystallize out as hematite only when ferrous compounds are either absent or present in quite subordinate amounts, for ferrous oxide unites with it to form magnetite.
Sayfa 391 - PROXIMATE CALCULATIONS. It is clear, from what has been already said, that it is rarely possible to predict, with anything like quantitative accuracy, what minerals will form when a magma of given composition solidifies. Partial and semiquantitative forecasts are practicable; we can say, for instance, that the proportion of orthoclase will lie between assignable limits; and if the analysis shows a ratio of silicon to oxygen lower than Si3O8, or 1 : 2.667, we may be reasonably sure that a calculable...
Sayfa 587 - Bismuth ores, wolfram, and arsenopyrite are common associates of the tinstone. These mineralogical data, the usual presence in stanniferous veins of species containing fluorine and boron, and also the alteration of the granite walls, have led to the very general belief that tin deposits of the ordinary type have been formed by the injection of vapors carrying the two elements above named and also the tin. This belief is strengthened by the various syntheses of cassiterite, in which boric oxide and...
Sayfa 51 - The procedure may not be rigorously exact, but the error in it is usually very small. If we consider an analysis as representing the composition of the anhydrous inorganic matter which is left when a water has been evaporated to dryness, the difficulty as regards iron disappears, for ferrous carbonate is then decomposed and ferric oxide remains. A similar difficulty in respect to the presence of bicarbonates also vanishes at the same time, for the bicarbonates of calcium and magnesium can only exist...
Sayfa 68 - In short, where the rainfall is abundant and the soil is naturally fertile, carbonate waters are the rule; in arid regions sulphates and chlorides prevail. This statement applies to the evidence now in hand, and must not be construed too sweepingly. We are dealing, not with invariable laws, but with tendencies. The condition thus indicated is probably the outcome of various causes, but one of the latter is easily found. In a fertile region organic matter is abundant and great quantities of carbonic...
Sayfa 439 - ' gives the mineral a very different composition. In the same memoir Carnot described a substance similar to minervite, from a cave near Oran, in Algeria. In this case the phosphatic deposits seem to have been formed by infiltrations from without the cavern, and the same is true of a white, pulverulent substance described by JC II.
Sayfa 518 - Loss on ignition. METAMORPHOSED SHALES. Shales, slates, phyllites, and mica schists form a continuous series of rocks which can be derived from clay, mud, or silt by progressive dehydration and crystallization. Some mica schists, of course, are traceable back to igneous rocks, but they fall outside of the present category. In order to study the development of schists from shales or clays, we must consider what compounds the latter contain capable of dehydration and what arc produced in this class...
Sayfa 604 - Bell." had a similar origin. The quartz veins, however, were near altered magnesian eruptives, in which no platinum was found. The occasional presence of platinum in sulphide ores has long been known, although it has attracted serious attention only within recent years. E.