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Bayerite, Al(OH)3, from Raoul Island, Kermadec Group, South Pacific

Published online by Cambridge University Press:  09 July 2018

K. A. Rodgers
Affiliation:
Departments of Geology and Chemistry, University of Auckland, Private Bag, Auckland, New Zealand
M. R. Gregory
Affiliation:
Departments of Geology and Chemistry, University of Auckland, Private Bag, Auckland, New Zealand
R. P. Cooney
Affiliation:
Departments of Geology and Chemistry, University of Auckland, Private Bag, Auckland, New Zealand

Abstract

Bayerite forms a cascading, travertine-like deposit over volcanic tuffs on Raoul Island in the South Pacific where it is produced from episodic discharge of spent, caustic aluminate solutions from a hydrogen generator. Textural evidence indicates microbial activity has possibly been involved in formation of the hydroxide, as well as sodium carbonate aluminate, present in minor amounts. X-ray powder diffraction and infrared spectral studies failed to give confident identification of the bayerite, the identity being confirmed by laser Raman spectroscopy. A high quality spectrum was obtained extending from 3280 to 3680 cm−1 and from 100 to 1000 cm−1.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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