Rocks Classified And Described a Treatise On Lithology
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Red melaphyre from Wiegersdorff. Matrix under the mi- croscope less distinct than the last-named; in it lie diallage- like crystals of augite.
Red melaphyre from the Birkenhoff. The matrix reddish- brown, and containing green acicular crystals of augite.
Ro^e considers these melaphyres to resemble chiefly those of Lowenberg, Lahn, and Landshut in Silesia. (Zeitschr. D. D. Geol. Gesellsch. 1859, p. 280. ) (f) THE OBERSTEIN AMYGDALOID. This rock, celebrated for its beautiful agates, is considered... by many geologists to belong to the melaphyres ; thus (e. G. ) : von Dechen, Dufrenoy, Elie de Beaumont, and Naumann. Its principal mass, usually brown or greenish, no doubt consists chiefly of felsite, and often contains small crystals of felspar, and amygdaloidal cavities filled with agate and other minerals ; accordingly we should term the rock a porphyrite. Delesse was the first to give a careful analysis of it. Its spec. Grav. Is 2-68. Chemically it contains 51-13 MELAPHYRE. 167 silica, 29-73 alumina and peroxide of iron, 473 of lime, 4073 magnesia and alkali, 3*68 water and carbonic acid.
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To quickly assess the difficulty of the text, read a short excerpt:
Red melaphyre from Wiegersdorff. Matrix under the mi- croscope less distinct than the last-named; in it lie diallage- like crystals of augite.
Red melaphyre from the Birkenhoff. The matrix reddish- brown, and containing green acicular crystals of augite.
Ro^e considers these melaphyres to resemble chiefly those of Lowenberg, Lahn, and Landshut in Silesia. (Zeitschr. D. D. Geol. Gesellsch. 1859, p. 280. ) (f) THE OBERSTEIN AMYGDALOID. This rock, celebrated for its beautiful agates, is considered... by many geologists to belong to the melaphyres ; thus (e. G. ) : von Dechen, Dufrenoy, Elie de Beaumont, and Naumann. Its principal mass, usually brown or greenish, no doubt consists chiefly of felsite, and often contains small crystals of felspar, and amygdaloidal cavities filled with agate and other minerals ; accordingly we should term the rock a porphyrite. Delesse was the first to give a careful analysis of it. Its spec. Grav. Is 2-68. Chemically it contains 51-13 MELAPHYRE. 167 silica, 29-73 alumina and peroxide of iron, 473 of lime, 4073 magnesia and alkali, 3*68 water and carbonic acid.
What to read after Rocks Classified And Described a Treatise On Lithology?
You can find similar books in the "Read Also" column, or choose other free books by Cotta, Bernhard Von, 1808-1879 to read onlineMoreLess
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