Report on the scientific results of the voyage of during the years 1873-76 : under the command of Captain George SNares, , Captain Frank Turle Thomson, . Fig. 31.—Andesite of Camiguin. Section of plagioclase, nearly perpendicular to PjM. j^ crossed nicols. Fio. 32.—Andesite of Oamiguin. Section of plagioclase, Baveno, albite, and pericline twins. is crossed nicols. This (fig. 32) shows I, Baveno twin; II, twin crystals of albite; I and III, twincrystals of pericline ; I, IV, Baveno twin. Fig. 33 shows I and II Carlsbad twin and one of albite; the extinctions f
Report on the scientific results of the voyage of during the years 1873-76 : under the command of Captain George SNares, , Captain Frank Turle Thomson, . Fig. 31.—Andesite of Camiguin. Section of plagioclase, nearly perpendicular to PjM. j^ crossed nicols. Fio. 32.—Andesite of Oamiguin. Section of plagioclase, Baveno, albite, and pericline twins. is crossed nicols. This (fig. 32) shows I, Baveno twin; II, twin crystals of albite; I and III, twincrystals of pericline ; I, IV, Baveno twin. Fig. 33 shows I and II Carlsbad twin and one of albite; the extinctions for I are35° on the average (32° to 38° for a, and 32° for b). The section then approaches theface a; for this individual. The individual II extinguishes at 10° for a and 6° for b;therefore the section for II approaches the face P. I prr Fig. 33.—Andesite of Camiguin. Section of plagioclase, albite and Carlsbad twin. ijg crossed nicols.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscientificexpedition
