 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...  United States Congressional Serial Set - Sayfa 3911908Tam görünüm - Bu kitap hakkında
 | John Purdy - 1838 - 420 sayfa
...service." * But, upon the whole, no dependence can be placed on the general set of the current ; and it is clear, from what has been already said, that it is always uncertain. When the wind is fresh between the North and East, it sets strongly to the southward... | |
 | John Purdy - 1844 - 534 sayfa
...service."! , . ' But, upon the whole, no dependance can be placed on the general set of the emrent; and it is clear, from what has been already said, that it is always uncertain. When the wind is fresh between the North and East, it sets strongly to the southward... | |
 | Alexander G. Findlay - 1867 - 738 sayfa
...River Plata. "But, upon the whole, no dependence can be placed on the general set of the current ; and it is clear, from what has been already said, that it is always uncertain. When the wind is fresh between the North and East it sets strongly to the southward... | |
 | Frank Wigglesworth Clarke - 1908 - 732 sayfa
...series, is a relatively infusible substance; but, as we have already seen, it probably forms a eiitectic mixture with the feldspars Which, by virtue of its...analysis shows a ratio of silicon to oxygen lower than Si3O8, or 1 : 2.667, we may be reasonably sure that a calculable amount of silica will remain uncombined.... | |
 | Geological Survey (U.S.) - 1908 - 734 sayfa
...mixture with the feldspars which, by virtue of its depressed melting point, is the last part of ;i magma to congeal. The minor accessories among the...analysis shows a ratio of silicon to oxygen lower than Si3O8, or 1 : 2.667, we may be reasonably sure that a calculable amount of silica will remain uncombined.... | |
 | 1908 - 924 sayfa
...melting point, is the last part of a magma to congeal. The minor accessories among tin; rock-forming1 minerals, which crystallize first although present...analysis shows a ratio of silicon to oxygen lower than Si3O8, or 1 : 2.667, we may be reasonably sure that a calculable amount of silica will remain uncombined.... | |
 | Frank Wigglesworth Clarke - 1911 - 800 sayfa
...is followed is probably a consequence of the fact that most rocks consist mainly of alumosilicates, and especially of feldspars and quartz. That is, they...analysis shows a ratio of silicon to oxygen lower than Si3O8, or 1 : 2.667, we may be reasonably sure that a calculable amount of silica will remain uncombined.... | |
 | Geological Survey (U.S.) - 1911 - 836 sayfa
...is followed is probably a consequence of the fact that most rocks consist mainly of alumo silicates, and especially of feldspars and quartz. That is, they...analysis shows a ratio of silicon to oxygen lower than Si3O8, or 1 : 2.667, we may be reasonably sure that a calculable amount of silica will remain uncombined.... | |
 | Frank Wigglesworth Clarke - 1911 - 794 sayfa
...substance; but, as we have already seen, it probably forms a eutectic mixture with the feldspars wluch, by virtue of its depressed melting point, is the last...semiquantitative forecasts are practicable; we can s&y<, for instance, that the proportion of orthoclase will lie between assignable limits; and if the... | |
 | Frank Wigglesworth Clarke - 1911 - 792 sayfa
...melting point, is the last part of a magma to congeal. The minor accessories among the rock-foi-ming minerals, which crystallize first although present...magma of given composition solidifies. Partial and scmiquantitative forecasts are practicable; we can say, for instance, that the proportion of orthoclase... | |
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