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The nature of ‘ameletite’

Published online by Cambridge University Press:  14 March 2018

D. S. Coombs  and
J. F. G. Wilkinson
D. S. Coombs
Affiliation:
Geology Department, University of Otago, Dunedin, New Zealand
J. F. G. Wilkinson
Affiliation:
Geology Department, University of Otago, Dunedin, New Zealand
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Summary

Originally described in phonolitic rocks from the Dunedin district, New Zealand, ameletite was considered by Marshall (1929) to be a chlorine-bearing sodium aluminium silicate, probably a feldspathoid, and later, a zeolite of unspecified composition. Optical, X-ray, and chemical data on several ‘ameletite’-bearing felsic volcanic rocks from the type area indicate that material previously designated as ameletite is variously nepheline and mixtures of sodalite, analcime, phillipsite, and nepheline. Criteria thought to be characteristic of ameletite are discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 279 , September 1967 , pp. 438 - 443
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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References

Marshall, (P.), 1929. The occurrence of a mineral hithertou nrecognized in the phonolites of Dunedin, New Zealand. Min. Mat., vol. 22, p. 174.Google Scholar
Marshall, (P.), 1947. Zeolite minerals as original components of igneous rocks. New Zealand Journ. Sei. Techn., vol. 28 (for 1946), p. 37.Google Scholar
Orville, (P.), 1958. Feldspar investigations. Carnegie Inst. Washington Year Book, vol. 57, p. 206.Google Scholar
Ulrich, (F. H. F.), 1891. On the occurrence of nepheline-bearing rocks in New Zealand. Rept. Australasian Assoc. Adv. Sci., vol. 3, p. 127.Google Scholar