The Nature of ‘Ameletite’

D. S. Coombs and J. F. G. Wilkinson
Geology Department, University of Otago, Dunedin, New Zealand and Geology Department, University of New England, Armidale, New South Wales

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.

Mineralogical Magazine; September 1967 v. 36; no. 279; p. 438-443; DOI: 10.1180/minmag.1967.036.279.15
© 1967, The Mineralogical Society
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