Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-27T09:04:27.825Z Has data issue: false hasContentIssue false
  • English
  • Français

Chemical variation in minerals of the astrophyllite group

Published online by Cambridge University Press:  05 July 2018

R. Macdonald  and
M. J. Saunders
R. Macdonald
Affiliation:
Department of Environmental Sciences, University of Lancaster
M. J. Saunders
Affiliation:
Department of Environmental Sciences, University of Lancaster
Get access Rights & Permissions [Opens in a new window]

Summary

Eight new and fourteen published analyses of astrophyllites are used to examine chemical variation within the group. Al, Ca, Cs, F, Mg, Mn, Nb, Rb, Sn, Zn, and Zr may all substitute in moderate to large amounts in the unit cell, whose basic formula is (K,Na)3Fe7Ti2Si8(O,OH)31; the natural Mn- and Nb- analogues of astrophyllite have been recorded. Ba, Cl, Cu, Li, P, Pb, Sr, and Ta are present, but in smaller amounts. The majority of specimens show appreciable cation deficiencies, up to 5 % of sites remaining vacant. Astrophyllites from undersaturated igneous rocks are characterized by higher Al, Ca, Mg, Mn, (OH+F), (K+Na) and Zr, and lower Li, Pb, and Zn contents than those from oversaturated igneous rocks. A ‘high-alkali’ type of astrophyllite is distinguished. A new occurrence of nigerite is noted.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 301 , March 1973 , pp. 97 - 111
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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

Abbey, (S.), 1967. Geol. Surv. Canada, Paper, 67-37, 35 PP- [M.A. 2I-1064].Google Scholar
B.I.S.R.A., 1967. Open report MG/D/556/67.CrossRefGoogle Scholar
Dean, (J. A.), 1960. Flame Photometry. New York (McGraw-Hill).Google Scholar
Groves, (A. W.), 1951. Silicate Analysis, 2nd edn, London (Allen and Unwin).Google Scholar
Huang, (W. H.) and Johns, (W. D.), 1967. Anal. Chim. Acta, 37, 508.CrossRefGoogle Scholar
Jeffrey, (P. G.) and Wilson (A.D.), i960. Analyst, 85, 478–86.Google Scholar
Kallman, (S.), Oberthin, (H.), and Liu, (R.), 1962. Anal. Chim. Acta, 4, 609.CrossRefGoogle Scholar
Kerber, (J. D.) and Barnett, (W. B.), 1969. Perkin Elmer Atomic Absorption Newsletter, 8, 113.Google Scholar
Kolthoff, (I. M.) and Sandell, (E. B.), 1952. A textbook of quantitative inorganic analysis, 3rd edn, New York (Macmillan).Google Scholar
Lingane, (J. J.) and Karplus, (R.), 1946. Ind. Eng. Chem. Anal. Ed., 8, 191.CrossRefGoogle Scholar
Mercy, (E. L. P.) and Saunders, (M. J.), 1966. Earth Planet. Set Letters, 169.CrossRefGoogle Scholar
Murphy, (J.) and Riley, (J. P.), 1958. Journ. Marine Biol. Ass. U.K., 9.CrossRefGoogle Scholar
Palilla, (F. C.), Adler, (N.), and Hiskey, (C. F.)s 1953. Anal. Chem., 25, 926.CrossRefGoogle Scholar
Peck, (L. C.), 1964. Bull. U.S. Geol. Surv. 1170.Google Scholar
Peck, (L. C.) and Smith, (V. C.), 1964. Talanta, 11, 1343.CrossRefGoogle Scholar
Sandell, (E. B.), 1959. Colorimetric determination of traces of metals, 3rd edn, New York and London (Wiley: Interscience).Google Scholar
Schoeller, (W. R.) and Powell, (A. R.), 1955. The analysis of minerals and ores of the rarer elements,., 3rd edn, London (Griffin).Google Scholar
Shapiro, (L.) and Brannock, (W. W.), 55. Anal. Chem., 2 , 560.CrossRefGoogle Scholar
Shapiro, (L.) 1962. Bull. U.S. Geol. Surv., 4-A, 46.Google Scholar
Slavin, (W.), 1968. Atomic absorption spectrometry. New York (Interscience).Google Scholar
Smith, (J. L.), 1853. Amer. Journ. Sci.ser. 2, 5, 234.Google Scholar
Wilson, (A. D.), 1955. Bull. Geol. Surv. Gt, Britain, 9, 56.Google Scholar