Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-27T07:58:20.106Z Has data issue: false hasContentIssue false
  • English
  • Français

Appraisal of the Ferguson method and the linear model using Δ(bc), Δ(b*c*), Δ(αγ), Δ(α*γ*) to estimate tetrahedral Al-contents in alkali feldspar

Published online by Cambridge University Press:  05 July 2018

Achille Blasi
Achille Blasi*
Affiliation:
Istituto di Mineralogia, Petrografia e Geochimica, Università degli Studi, Via Botticelli 23, 20133 Milano, Italy
Get access Rights & Permissions [Opens in a new window]

Abstract

The new method proposed by Ferguson (1980, 1981) for estimating the T-site occupancies in K-rich feldspars from lattice constants is discussed and compared with the linear model using the structural indicators Δ(bc), Δ(b*c*), Δ(αγ), Δ(α*γ*). The latter method appears to be considerably more effective in view of its wider application to alkali feldspars of different compositions and structural states. Ferguson's (1980, 1981) method has been conceived for K-rich feldspars alone and may produce results that tend to be more erroneous the further a K-rich feldspar lies from the two-step ordering paths involved in the formulation of the determinative procedure itself.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 341 , December 1982 , pp. 465 - 468
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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

Blasi, A. (1977) Mineral. Mag. 41, 525–6.CrossRefGoogle Scholar
Blasi, A. (1978) Tschermaks Mineral. Petrogr. Mitt. 25, 46–56.CrossRefGoogle Scholar
Blasi, A. (1980) Neues Jahrb. Mineral., Abh. 138, 109–21.Google Scholar
Blasi, A. and Blasi De Pol, C. (1977) Rend. Soc. Ital. Mineral. Petrol. 33, 497–509.Google Scholar
Blasi, A. and Zanazzi, P. F. (1981) Neues Jahrb. Mineral., Abh. 142, 71–90.Google Scholar
Colvillr, A. A., and Ribbe, P. H. (1968) Am. Mineral. 53, 25–37.Google Scholar
Dal Negro, A., De Pieri, R., Quareni, S., and Taylor, W. H. (1978) Acta Crystallogr. B24, 2699–707.CrossRefGoogle Scholar
Ferguson, R. B. (1980) Can. Mineral. 18, 443–58.Google Scholar
Ferguson, R. B. (1981) Ibid. 19, 363–5.Google Scholar
Harlow, G. E., and Brown, G. E., Jr. (1980) Am. Mineral. 65, 986–95.Google Scholar
Hovis, G. L., and Peckins, E. (1978) Contrib. Mineral. Petrol. 66, 345–9.CrossRefGoogle Scholar
Jones, J. B. (1968) Acta Crystallogr. B24, 35–58.Google Scholar
Ribbe, P. H. (1975) In Feldspar Mineralogy, Ribbe, P. H. (ed.), Mineral. Soc. Am., Short Course Notes 2, R1–R52.Google Scholar
Ribbe, P. H. (1979) Am. Mineral. 64, 40–28.Google Scholar
Ribbe, P. H. and Gibbs, G. V. (1969) Ibid. 54, 85–94.Google Scholar
Ribbe, P. H. Phillips, M. V., and Gibbs, G. V. (1974) In The Feldspars, W. S. MacKenzie and Zussmann, J. (eds.), Proc. NATO Adv. Study Inst., Manchester, Crane, Russak, and Company Inc., New York, 25–48.Google Scholar
Smith, J. V. (1968) Geol. Soc. Am. Abstr. Progr., Mexico City, 283.Google Scholar
Smith, J. V. (1974) Feldspar minerals. 1. Crystal structure and physical properties. Springer-Vedag, Berlin.Google Scholar
Smith, J. V. and Bailey, S. W. (1963) Acta Crystallogr.. 16, 801–11.CrossRefGoogle Scholar
Stewart, D. B., and Ribbe, P. H. (1969) Am. J. Sci. 267A, 444–62.Google Scholar
Smith, J. V. and Wright, T. L. (1974) Bull. Soc. fr. Mineral. Cristallogr. 97, 356–77.Google Scholar