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A second occurrence of dalyite and the petrology of some ejected syenite blocks from São Miguel, Azores

Published online by Cambridge University Press:  14 March 2018

J. R. Cann
J. R. Cann*
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge1
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Summary

Dalyite, K2ZrSi6O15, occurs in the ejected syenite blocks of Serra de Agua de Pau (Lagoa do Fogo), São Miguel, Azores, in an assemblage sanidine-arfvedsonite-quartz-aegirine-fayalite-astrophyllite-dalyite-pyrrhite. Other blocks from the same locality contain biotite-zircon in place of astrophyllite-dalyite. A comparison made between the chemistry of one specimen of each type indicates that they may be related by paraeutectoid fractional crystallization.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 278 , June 1967 , pp. 227 - 232
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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