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Metavivianite and kerchenite: a review

Published online by Cambridge University Press:  05 July 2018

K. A. Rodgers
K. A. Rodgers*
Affiliation:
Department of Geology, University of Auckland, Private Bag, Auckland, New Zealand
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Abstract

Metavivianite has been shown to be not dimorphous with vivianite. Assuming the homogeneity and uniformity of the original type samples, it is a triclinic hydrated ferri-ferrous hydroxy phosphate whose formula may be given as Fe2+3-xFe3+x(po4)2(OH)x(8-x)H2O where x > 1.4. The precise oxidation limits between which the triclinic lattice is stable are not known but the structure persists close to total oxidation of all iron. The structure of metavivianite was established using a fragment of kerchenite whose formula as originally given is covered by the general metavivianite formula. Assuming the homogeneity of the original (1907) samples, kerchenite and metavivianite appear to be identical.

Keywords

metavivianitevivianitekerchenite
Type
Non-silicate mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 358 , December 1986 , pp. 687 - 691
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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