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Manganese-rich calcic amphiboles of the tremolite-ferro-actinolite series

Published online by Cambridge University Press:  05 July 2018

A. H. Damman  and
W. J. Lustenhouwer
A. H. Damman
Affiliation:
The Free University, de Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
W. J. Lustenhouwer
Affiliation:
Netherlands Organisation for Scientific Research, de Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
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Abstract

Amphiboles of the tremolite-ferro-actinolite series from the Bergslagen district in central Sweden have between 0 and 46% of their M1-M3 sites occupied by Mn. These amphiboles are divided into two groups; (1) a group characterised by Mn (M1-M3) > (Mg or Fe) (M1-M3), and (2) a group with much lower contents of Mn (M1-M3), showing the following chemical characteristics: (a) Mn (M1-M3) never exceeds Fe (M1-M3); (b) in Mg-rich members of the group [Mg (M1-M3) > (Mn or Fe) (M1- M3)], the highest amounts of Mn (M1-M3) occur in amphiboles with about 2.20 Mg (M1-M3) per formula unit (pfu); in Fe-rich members of the group Fe [(M1-M3) > (Mg or Mn) (M1-M3)] high amounts of Mn (M1-M3) [> 0.4 Mn (MI-M3)] pfu only occur in amphiboles with >3.40 Fe (M1-M3) pfu; (d) the lowest amounts of Mn (M1-M3) occur in amphiboles with Mg (M1-M3) = Fe (M1-M3).

Mn (M4) increases with increasing amounts of Mn (M1-M3), indicating that solid solution towards the tirodite-dannemorite series is enhanced by incorporation of Mn (M1-M3).

Keywords

amphiboletremoliteactinoliteBergslagenSweden
Type
Mineralogy
Information
Mineralogical Magazine , Volume 56 , Issue 384 , September 1992 , pp. 391 - 398
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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References

Baker, J.H. (1985) Mineral. Mag., 49, 107–15.CrossRefGoogle Scholar
Beetsma, R. (1990) Unpubl. M.Sc. thesis, the Free University, Amsterdam, Holland, 116 pp.Google Scholar
Damman, A.H. (1989a) Am. Mineral., 74, 573–85.Google Scholar
Damman, A.H. (1989b) Mineral. Mag., 53, 613–26.CrossRefGoogle Scholar
Damman, A.H. and Kieft, C. (1990) Can. Mineral., 28, 17–36.Google Scholar
Geyer, P. and Magnussion, N.H. (1944) Sver. Geol.Unders., Set. Ca 35.Google Scholar
Hellingwerf, R.H., Lilljequist, R., and Ljung, S.L. (1988) Geol. Mijnbouw, 67, 294–313.Google Scholar
Magnusson, N.H. (1930) Sver. Geol. Unders., Ser. Ca 23.Google Scholar
Ripa, M. (1988) Geol. Mijnbouw, 67, 443–58.Google Scholar
Robinson, Peter, Spear, F.S. Schumacher, J.C., Laird, J., Klein, C., Evans, E.W., and Doolan, B.L. (1982) Rev. MineraL, 9b, 1-228.Google Scholar