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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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