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V.—On Zonal Structure in Olivine
Published online by Cambridge University Press: 01 May 2009
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In a recent paper on the volcanic rocks of Kilimandjaro I referred to the presence in the basaltic lavas of olivine crystals, which appeared to possess zonal structure. Although actual proof was wanting, still the symmetrical arrangement of the inclusions, as also the mode of alteration of the crystals, rendered the occurrence of such a structure highly probable. The olivines, being rich in iron, were altered into ferric oxide or ferric hydrate; and the line of division between the fresh and decomposed portions was mostly parallel to the crystallographic outlines. There was, however, no break in the optical continuity, such as the presence of zonal structure would demand.
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References
page 493 note 1 “Ueber die Gesteine des Kilimandscharo und dessen Umgebung.” Tschermak's Mittheilungen, 1888, vol. x. pp. 224 and 226; also plate vii. fig. 2.Google Scholar
page 493 note 2 The mineral gives reactions characteristic for olivine.
page 493 note 3 “Beitrag zur Kenntniss der Gest. d. Insel Palma.” Neues Jahrbuch für Mineralogie, etc., 1879, p. 820.Google Scholar
page 493 note 4 “Die Basaltgest. des südlichen Bakony,” Budapest, 1879, pp. 27 and 193.Google Scholar
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page 494 note 1 Ger. Reproduktion Verletzter Theile.
page 494 note 2 “Etudes sur les modes d'accroisement des cristaux, etc.” Compt. rend. tome 43, 1856, p. 795Google Scholar; see also,Scharff, F., “Ueber die ausheilung verstümmelter oder im Wachsen verhindert gewesener Krystalle, etc.,” Pogg. Ann. vol. 109, 1860, p. 529;Google Scholar Ostwald, W., Lehrbuch d. allg. Chemie, Leipzig, 1885, Bd. i. p. 738Google Scholar; according to Scharff (l.e.) Jordan made an observation similar to Pasteur's as far back as 1842 (in Müller's Archiv.).