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Books Bücher 1 - 6 von 6 in In the section the rock at once shows its character as a dark, basic lamprophyre,...
" In the section the rock at once shows its character as a dark, basic lamprophyre, consisting mainly of biotite and pyroxene. There is a little iron ore present, but its amount is small and much less than is usually seen in rocks of this class. The biotite... "
The Occurrence and Distribution of Corundum in the United States, - Seite 28
von Joseph Hyde Pratt - 1901 - 98 Seiten
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The American Journal of Science

1897
...characteristic of this occurrence and often have traces of a blackish crust upon them. Microscopical. In thin section the rock at once shows its character as a...seen in rocks of this class. The biotite is strongly pleocnroic, varying between an almost colorless and a strong, clear, brown tint. It occurs in ragged...
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Bulletin, Ausgaben 267-273

1905
...it as follows: « In thin section the rook nt once shows Its character as a dark, basic lampropbyre. consisting mainly of biotite and pyroxene. There is...seen in rocks of this class. The biotite is strongly pleochroie, varying between nn almost color« Tsehermaks mineral, und petr. Mlttheil., vol. 14. 1894,...
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Corundum and the Peridotites of Western North Carolina

Joseph Hyde Pratt, Joseph Volney Lewis - 1905 - 464 Seiten
...feldspathoid constituent. In regard to the classification of this rock, Professor Pirsson ™ says : In thin section the rock at once shows its character as a...lamprophyre, consisting mainly of biotite and pyroxene The rock appears to have its closest affinities in the monchiquite group, of which it may be considered...
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Reports of the North Carolina Geological and Economic Survey, Band 1

North Carolina Geological and Economic Survey, North Carolina Geological Survey (1883-1905) - 1905
...feldspathoid constituent. In regard to the classification of this rock, Professor Pirsson " says : In thin section the rock at once shows its character as a dark basic lamprophyre, consisting mainiy of biotite and pyroxene The rock appears to have its closest affinities in the monchiquite group,...
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Nature, Band 57

Sir Norman Lockyer - 1898
...of a dark grey, basic apiwaranct, and have an uneven fracture. In thin sections it appears as a dark lamprophyre, consisting mainly of biotite and pyroxene. There is a little iron ore present, but much less than is usually seen in rocks of this class. — Electrical measurements by alternating currents,...
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Nature, Band 57

Sir Norman Lockyer - 1898
...a dark grey, basic api>earance, and have an uneven fracture. In thin sections it appears as a dark lamprophyre, consisting mainly of biotite and pyroxene. There is a little iron ore present, but much less than is usually seen in rocks of this class. — Electrical measurements by alternating currents,...
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