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New evidence on secondary twinning in albitic plagioclases

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Abstract

Twinnings in albitic partially disordered plagioclases (An%=0–5; 2V variable between +80° and -87°) are described; they show optical-morphological features very similar to those exhibited by secondary twinning in calcic plagioclases. One of the twinning observed shows strong analogies with a phenomenon induced on a partially disordered albite in laboratory experiments (Borg and Heard, 1969). The data give new evidence on the debated existence of secondary twinning in albitic plagioclases.

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References

  • Borg, I., Handin, J.: Experimental deformation of crystalline rocks. Tectonophysics 3, 249–386 (1966).

    Article  Google Scholar 

  • —, Heard, H. C.: Mechanical twinning and slip in experimentally deformed plagioclases. Contr. Mineral. and Petrol. 23, 128–135 (1969).

    Google Scholar 

  • Buerger, M. J.: The genesis of twin crystals. Am. Mineralogist 30, 469–482 (1945).

    Google Scholar 

  • Emmons, R. C., Gates, R. M.: Plagioclase twinning. Bull. Geol. Soc. Am. 54, 287–304 (1943).

    Google Scholar 

  • Gottardi, G.: Studio cristallografico di rare e complesse geminazioni nell'Albite di una roccia elbana. Atti Soc. Toscana Sci. Nat. 69, 17–36 (1962).

    Google Scholar 

  • Laves, F.: Mechanische Zwillingsbildung in Feldspäten in Abhängigkeit von Ordnung-Unordnung des (Si, Al)4O8-Gerüstes. Naturwissenschaften 39, 456–547 (1952).

    Google Scholar 

  • —: Mechanical twinning in acid plagioclase. Am. Mineralogist 50, 511–514 (1965).

    Google Scholar 

  • Mügge, O., Heide, F.: Einfache Schiebungen am Anorthit. Neues Jahrb. Mineral. I, 64, 163–170 (1931).

    Google Scholar 

  • Seifert, K. E.: The genesis of plagioclase twinning in the Nonewaug granite. Am. Mineralogist 49, 297–320 (1964).

    Google Scholar 

  • —: Deformation bands in Albite. Am. Mineralogist 50, 1469–1472 (1965).

    Google Scholar 

  • Starkey, J., Brown, W. L.: Künstliche Erzeugung mechanischer Zwillinge in Anorthit CaAl2Si2O8. Z. Krist. 120, 388–392 (1964).

    Google Scholar 

  • Vance, J. A.: Polysinthetic twinning in plagioclase. Am. Mineralogist 46, 1097–1119 (1961).

    Google Scholar 

  • Vogel, T. A.: Optical-crystallographic scatter in plagioclase. Am. Mineralogist 49, 614–633 (1964).

    Google Scholar 

  • —, Seifert, K. E.: Deformation twinning in ordered plagioclase. Am. Mineralogist 50, 514–518 (1964).

    Google Scholar 

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  1. Istituto di Mineralogia e Petrografia, Modena, Italy

    Silvio Capedri

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  1. Silvio Capedri
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Capedri, S. New evidence on secondary twinning in albitic plagioclases. Contr. Mineral. and Petrol. 25, 289–296 (1970). https://doi.org/10.1007/BF00399289

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  • DOI: https://doi.org/10.1007/BF00399289

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