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TEM study of a special grain boundary in a synthetic K-feldspar bicrystal: Manebach Twin

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Abstract

 A monoclinic KAlSi3O8 feldspar Manebach twin boundary was synthesized by diffusion bonding and examined using high-resolution transmission electron microscopy. The sharp (001) twin boundary is straight and free of strain. The boundary width is smaller than d001. There is no rigid body shift observed at the twin boundary, and the feldspar structure is arranged symmetrically across (001). The twin boundary structure consists of bridged tetrahedral crankshafts, which are characteristic of the feldspar lattice. The grain boundary structure is in good agreement with the geometrical model of Taylor et al. (1934). The grain boundary composition of K1/2H1/2AlSi3O8 differs from their model.

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Authors and Affiliations

  1. GeoForschungsZentrum Potsdam, Telegrafenberg D426, 14473 Potsdam, Germany Tel.: + 49-(0)331–288 1323 Fax: + 49-(0)331–288 1328 e-mail: stefan.heinemann@gfz-potsdam.de, , , , , , DE

    S. Heinemann, R. Wirth & G. Dresen

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  1. S. Heinemann
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  2. R. Wirth
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  3. G. Dresen
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Received: 13 February 2002 / Accepted: 24 December 2002

Acknowledgements We thank M. Rühle, S. Hutt, J. Mayer, A. Strecker and U. Salzberger at MPI, Stuttgart, for their support and valuable advice in preparing TEM sections of bicrystals.

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Heinemann, S., Wirth, R. & Dresen, G. TEM study of a special grain boundary in a synthetic K-feldspar bicrystal: Manebach Twin. Phys Chem Minerals 30, 125–130 (2003). https://doi.org/10.1007/s00269-003-0297-3

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  • DOI: https://doi.org/10.1007/s00269-003-0297-3

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