Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-28T19:32:46.592Z Has data issue: false hasContentIssue false
  • English
  • Français

Orientation of the boundaries of out-of-step domains in anorthite

Published online by Cambridge University Press:  14 March 2018

Paul H. Ribbe  and
Alan A. Colville
Paul H. Ribbe
Affiliation:
Department of Geological Sciences, Virginia Polytechnic Institute, Blacksburg, Virginia
Alan A. Colville
Affiliation:
Department of Geological Sciences, Virginia Polytechnic Institute, Blacksburg, Virginia
Get access Rights & Permissions [Opens in a new window]

Summary

The orientation of the boundaries of out-of-step domains in ‘transitional’ anorthite has been deduced from the direction of elongation of the diffuse X-ray reflections h + h + l = 2n + 1 in selected precession photographs. The reflections are elongated normal to which is in the zone and contains the body-centring vector (a+b−c)/2. The structure is presumed to be perfect parallel to . Atoms in essentially identical, primitive anorthite-like domains are related across the out-of-step domain boundaries by body-centring vectors. Increasing diffuseness of the h + k + l = 2n + 1 reflections indicates progressively smaller domains (more frequent domain boundaries), and when thesereflections disappear, the structure has become body-centred on the average.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 282 , June 1968 , pp. 814 - 819
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Brown, (W. L.), Hoffman, (W.), and Laves, (F.), 1963. Naturwiss., vol. 6, p. 1.Google Scholar
Fleet, (S. G.), Chandrasekhar, (S.), and Magaw, (H. D.), 1966. Acta Cryst., vol. 21, p. 782.CrossRefGoogle Scholar
Gay, (P.), 1953. Min. Mag., vol. 30, p. 169.Google Scholar
Gay, (P.), 1954. Ibid., p. 428.CrossRefGoogle Scholar
Goldsmith, (J.) and Laves, (F.), 1955. Zeits. Krist., vol. 106, p. 213.Google Scholar
Jeffrey, (Z. W.), 1953. Acta Cryst., vol. 6, p. 821.CrossRefGoogle Scholar
Laves, (F.) and Goldsmith, (J.), 1951. Amer. Cryst. Assoc. Meeting, Chicago. Abstract, p. 10.Google Scholar
Laves, (F.) and Goldsmith, (J.), 1954a. Acta Cryst., vol. 7, p. 131.CrossRefGoogle Scholar
Laves, (F.) and Goldsmith, (J.), 1954b. Ibid., p. 465.CrossRefGoogle Scholar
Megaw, (H. D.), 1960. Proc. Roy. Soc., vol. 259, p. 159.Google Scholar
Ribbe, (P. H.) and Megaw, (H. D.), 1962. Norsk geol. tidsskr., vol. 42/2, p. 158.Google Scholar
Willis, (B. T. M.), 1958. Proc. Roy. Soc., vol. 248, p. 183.Google Scholar
Wood, (E. A.), 1959. Zeits. Krist., vol. 112, p. 97.CrossRefGoogle Scholar
Wooster, (W. A.), 1962. Diffuse X-ray reflections from crystals. Oxford Vniversity Press, London.Google Scholar