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Phurcalite from Dartmoor, Southwest England, and its identity with ‘nisaite’ from Portugal

Published online by Cambridge University Press:  05 July 2018

R. S. W. Braithwaite ,
W. H. Paar  and
J. E. Chisholm
R. S. W. Braithwaite
Affiliation:
Chemistry Department, University of Manchester Institute of Science and Technology, Manchester M60 1QD
W. H. Paar
Affiliation:
Institut für Geowissenschaften, Mineralogie-Petrographie, der Universität Salzburg, Hellbrunnerstrasse 34/III, A-5020 Salzburg, Austria
J. E. Chisholm
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London, SW7 5BD
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Abstract

Yellow blades on joint surfaces in granite from Merrivale quarry, Dartmoor, Devon, are shown to be of a slightly aresenatian variety of phurcalite by X-ray powder diffraction, infrared spectroscopy, electron microprobe and thermal analyses and optical methods. The results from these techniques are tabulated, including assignments for infrared absorption bands. Comparison of X-ray powder diffraction, infrared spectroscopic and optical data with those obtained from samples of ‘nisaite’, an incompletely described mineral from Nisa, Portugal, indicates that the latter is also phurcalite.

Keywords

phurcalitenisaiteDartmoorPortugal
Type
Non-silicate Mineralogy
Information
Mineralogical Magazine , Volume 53 , Issue 373 , December 1989 , pp. 583 - 589
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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