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Westerveldite from Igdlúnguaq, Ilímaussaq alkaline massif, South Greenland1

Published online by Cambridge University Press:  05 July 2018

I. S. Oen ,
E. A. J. Burke  and
C. Kieft
I. S. Oen
Affiliation:
Geologisch Instituut der Universiteit van Amsterdam
E. A. J. Burke
Affiliation:
Instituut voor Aardwetenschappen der Vrije Universiteit
C. Kieft
Affiliation:
Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek (ZWO)
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Summary

Microprobe and X-ray investigation of a mineral occurring with breithauptite, nickeline, and other arsenides in the naujaite at Igdlúnguaq, Ilímaussaq alkaline massif, S. Greenland, shows that this mineral, which was formerly misidentified as ‘maucherite’, is a westerveldite (Fe0·85Ni0·15)As, of much iron-richer composition than the nickeloan westerveldites from the only two other known occurrences of this mineral. Westerveldite from Igdlúnguaq was presumably formed by reaction of nickeline with iron-rich solutions under conditions of reheating at temperatures of about 450° C and under partial pressures of arsenic below those necessary to stabilize nickeline. Sulphur-bearing löllingite occurs as exsolution blades in the westerveldite. Iron-rich nickeline, up to a composition (Ni0·82Fe0·18)As0·95Sb0·05, was presumably formed by recrystallization of nickeline in the transition stage just before this mineral became unstable and was replaced by westerveldite.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 317 , March 1977 , pp. 77 - 83
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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Footnotes

1

Contribution to the mineralogy of Ilímaussaq no. 44.

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