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Dalyite, a new potassium zirconium silicate, from Ascension Island, Atlantic

Published online by Cambridge University Press:  14 March 2018

R. Van Tassel  and
M. H. Hey
R. Van Tassel
Affiliation:
Institut royal des Sciences Naturelles de Belgique
M. H. Hey
Affiliation:
Department of Mineralogy British Museum (Natural History)
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Extract

Ejected blocks of piutonic igneous facies have long been known in the trachytic and basaltic tufts of Green Mountain and Middleton Peak on Ascension Island, and a petrographic account of them has been recorded by Professor R. A. Daly in his memoir on the geology of Ascension Island.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 217 , June 1952 , pp. 850 - 857
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1952

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References

page 850 note 1 Daly, R. A., The geology of Ascension Island. Proc. Amer. Acad. Arts & Sci., 1925, vol. 60, no. 1, pp. 1-80 Google Scholar (see pp. 63-68). [M.A. 3-385.]

page 850 note 2 This rock specimen was collected during the cruise of H.M.S. Challenger, 1873-6, and is described by A. F. Renard in the Challenger Report as amphibolie granite. Report on the petrology of Oceanic Islands, 1889, pp. 63-64.

page 850 note 3 For these and numerous other sloecimens of ejected blocks on Green Mountain and Middleton Peak the Department of Mineralogy and Petrology at Cambridge is greatly indebted to the Manager of Cable and Wireless Ltd., Ascension Island, who on my inquiry, through the kind offices of the Directorate of Colonial Geological Surveys, arranged for the collection of this material. Grateful acknowledgement is due to Messrs. M. A. Miles, I-I. W. Benjamin, and G. A. O'Dean, members of the Company's staff, who were responsible for the field work.--C. E. Tilley.

page 851 note 1 Donnay, J. D. H., Rules for the conventional orientation of crystals. Amer. Min., 1943, vol. 28, pp. 313-328 Google Scholar. [M.A. 9-140.[

page 856 note 1 Prider, R. T.. Some minerals from the leucite-rich rocks of the West Kimberley area, Western Australia. Min. Mag., 1939, vol. 25, pp. 373-387.Google Scholar