 | 1898 - 1090 pages
...siliceous rocks was well founded or not. The choice was, however, confined largely to those rocks analyzed in this laboratory within the past three or four years...existence of the mineral roscoelite, classed as a vanadium mica, at once suggests itself, that the ultimate source of the vanadium may be one or more... | |
 | Frank Wigglesworth Clarke - 1900 - 984 pages
...siliceous rocks was well founded or not. The choice was, however, confined largely to those rocks analyzed in this laboratory within the past three or four years...existence of the mineral roscoelite, classed as a vanadium mica, at once suggests itself, that the ultimate source of the vanadium may be one or more... | |
 | Marcus Baker - 1900 - 350 pages
...the United States, show not only its general qualitative and quantitative distribution, but that it predominates in the less siliceous igneous rocks and...is absent, or nearly so, in those high in silica. In some of the more basic rocks it occurs in sufficient amount to seriously affect the figures for... | |
 | 1907 - 874 pages
...the United States, show, not only its general qualitative and quantitative distribution, but that it predominates in the less siliceous igneous rocks and...is absent, or nearly so, in those high in silica. In some of the more basic rocks it occurs in sufficient amount to affect seriously the figures for... | |
 | Henry Gannett - 1906 - 644 pages
...the United States, show not only its general qualitative and quantitative distribution, but that it predominates in the less siliceous igneous rocks and...is absent, or nearly so, in those high in silica. In some of the more basic rocks it occurs in sufficient amount to affect seriously the figures for... | |
 | William Francis Hillebrand - 1907 - 212 pages
...the United States, show not only its general qualitative and quantitative distribution, but that it predominates in the less siliceous igneous rocks and...is absent, or nearly so, in those high in silica. In some of the more basic rocks it occurs in sufficient amount to affect seriously the figures for... | |
 | Samuel Stinson Gannett, David Henry Baldwin - 1910 - 490 pages
...the United States, show not only its general qualitative and quantitative distribution, but that it predominates in the less siliceous igneous rocks and...is absent, or nearly so, in those high in silica. In some of the more basic rocks it occurs in sufficient amount to affect seriously the figures for... | |
 | William Francis Hillebrand - 1910 - 252 pages
...the United States, show not only its general qualitative and quantitative distribution, but that it predominates in the less siliceous igneous rocks and...is absent, or nearly so, in those high in silica. In some of the more basic rocks it occurs in sufficient amount to affect seriously the figures for... | |
 | Henry Stephens Washington - 1910 - 244 pages
...up to one-half of one per cent of Cr 2 0a. Vanadium, according to the investigations of Hillebrand, "predominates in the less siliceous igneous rocks...is absent, or nearly so, in those high in silica." It is an ingredient of pyroxenes, hornblendes and biotites, but not of olivine, and is also found as... | |
 | John Milton Nickles - 1919 - 586 pages
...the United States, show not only its general qualitative and quantitative distribution, but that it predominates in the less siliceous igneous rocks and...is absent, or nearly so, in those high in silica. In some of the more basic rocks it occurs in sufficient amount to affect seriously the figures for... | |
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... of a coal of unknown origin, and 0.45 per cent of a coal from Peru. Still later examinations in this laboratory of about 100 rocks, chiefly igneous, covering nearly the whole continental territory of the United States, show, not only its general qualitative... 
