Skip to main content
SpringerLink
Log in

An electron microscopic study of some twinning and exsolution textures in microcline amazonites

  • Published:
Physics and Chemistry of Minerals Aims and scope Submit manuscript

Abstract

An electron microscopic study of the twinning and exsolution textures in one hydrothermal and two pegmatitic amazonites from southern Norway is reported. From observations of three types of interfaces: between twins, between domains twinned on different laws and between Na- and K-feldspar domains, perthitic textures involving low albite lenses up to 10 μm long in a twinned microcline matrix are shown to result from exsolution from the triclinic phase. Complex twinning on albite and pericline laws is suggested to be the result of strains induced by exsolution. Other textures, involving the late introduction of Na at low temperature in a pegmatite and the occurrence of Pb-rich and plagioclase crystallites in a hydrothermal amazonite, are described.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Akizuki, M.: Electron microscope study of twinning in microcline. Am. Mineralogist 57, 797–808 (1972)

    Google Scholar 

  • Andersen, O.: The genesis of some types of feldspar from granite pegmatites. Norsk Geol. Tidsskr. 10, 113–205 (1928)

    Google Scholar 

  • Catanzaro, E.J., Gast, P.W.: Isotopic composition of lead in pegmatite feldspars. Geochim. Cosmochim. Acta 19, 113–126 (1960)

    Google Scholar 

  • Dietrich, R.V.: K-feldspar structural states as petrogenetic indicators. Norsk Geol. Tidsskr. 42 (2), 394–414 (1962)

    Google Scholar 

  • Gandais, M., Guillemin, C., Willaime, C.: Study on boundaries in cryptoperthites 8th Intern. Cong. of Electron Microscopy, Canberra 1, 508–509 (1974)

    Google Scholar 

  • Hovis, G.L.: A solution calorimetric and X-ray investigation of Al-Si distribution in monoclinic potassium feldspars. In: The Feldspars, Proc. NATO Advan. Study Inst. July 1972, pp. 114–144, Manchester Univ. Press 1974

  • Laves, F.: The lattice and twinning of microcline and other potash feldspars. J. Geol. 58, 548–571 (1950)

    Google Scholar 

  • Laves, F., Goldsmith, J.R.: Polymorphism, order, disorder, diffusion and confusion in the feldspars. Inst. Lucas Mallada C.S.I.C. 8, 71–80 (1961)

    Google Scholar 

  • Laves, F., Soldatos, K.: Plate-perthite — a new perthitic intergrowth in microcline single crystals, a recrystallization product. Z. Kryst. 117, 218–226 (1962)

    Google Scholar 

  • Laves, F., Soldatos, K.: Die Albit/Mikroklin-Orientierungs-Beziehungen in Mikroperthiten und deren genetische Deutung. Z. Kryst. 118, 69–102 (1963)

    Google Scholar 

  • Megaw, H.D.: The architecture of the feldspars. In: The Feldspars, Proc. NATO Advan. Study Inst. July 1972 pp. 2–24, Manchester Univ. Press 1974

  • Oftedal, I.: Lepidolite- and cassiterite-bearing pegmatites in Tördal, Telemark, Norsk Geol. Tidsskr. 22, 1–14 (1942) (Norwegian with English Summary)

    Google Scholar 

  • Oftedal, I.: Heating experiments on amazonite. Mineral. Mag. 31, 417–419 (1957)

    Google Scholar 

  • Petrović, R.: Diffusion of alkali ions in alkali feldspars. In: The Feldspars. Proc. NATO Advan. Study Inst. July 1972, pp. 174–182, Manchester University Press 1974

  • Robin, P-Y.F.: Stress and strain in cryptoperthitic lamella and the coherent solvus of alkali feldspars. Am. Mineralogist 59, 1299–1318 (1974)

    Google Scholar 

  • Rosenqvist, I.Th.: Some investigations of the crystal chemistry of silicates. I. Diffusion of Pb and Ra in feldspar. Acta Chem. Scand. 3, 569–583 (1949)

    Google Scholar 

  • Ryzhova, T.V., Aleksandrov, K.S.: The elastic properties of potassium-soda feldspars. Izv. Akad. Nauk. SSSR Physics of the Solid Earth 1, 98–102 (1965)

    Google Scholar 

  • Willaime, C., Brown, W.L.: A coherent elastic model for the determination of orientation of exsolution boundaries: application to feldspars. Acta Cryst. A30, 316–331 (1974)

    Google Scholar 

  • Willaime, C., Brown, W.L., Gandais, M.: Physical aspects of exsolution in natural alkali feldspars. In: Electron Microscopy in Mineralogy pp. 248–257, Springer International 1976

  • Yund, R.A., McLaren, A.C., Hobbs, B.E.: Coarsening kinetics of exsolution microstructure in alkali feldspar. Contrib. Mineral. Petrol. 48, 45–55 (1974)

    Google Scholar 

Download references

Author information

Author notes

  1. J. E. Tibballs

    Present address: School of Physics, University of Melbourne, 3052, Parkville, Victoria, Australia

Authors and Affiliations

  1. Institute of Physics, University of Oslo, Blindern, Oslo 3, Norway

    J. E. Tibballs & A. Olsen

Authors
  1. J. E. Tibballs
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. Olsen
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Tibballs, J.E., Olsen, A. An electron microscopic study of some twinning and exsolution textures in microcline amazonites. Phys Chem Minerals 1, 313–324 (1977). https://doi.org/10.1007/BF00307570

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00307570

Keywords

Search

Navigation