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X-ray diffraction studies of vivianite, metavivianite, and barićite

Published online by Cambridge University Press:  05 July 2018

T. Sameshima ,
G. S. Henderson ,
P. M. Black  and
K. A. Rodgers
T. Sameshima
Affiliation:
Department of Geology, University of Auckland, Private Bag, Auckland, New Zealand
G. S. Henderson
Affiliation:
Department of Geology, University of Auckland, Private Bag, Auckland, New Zealand
P. M. Black
Affiliation:
Department of Geology, University of Auckland, Private Bag, Auckland, New Zealand
K. A. Rodgers
Affiliation:
Department of Geology, University of Auckland, Private Bag, Auckland, New Zealand
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Abstract

Vivianite specimens from various world localities yield X-ray powder patterns of two types: one corresponds with that shown by synthetic Fe3(PO4)2 · 8H2O and is not readily distinguished from that of barićite; the second shows reflections of monoclinic vivianite and triclinic metavivianite along with reflections of a bobierrite-type phase. The triclinic phase occurs as two twin-related lattices with twin plane 110 being the structural equivalent of 010 in the monoclinic phase. The relationship of the bobierrite-type lattice to the other two has not been established. The ternary pattern is produced by some coarse-grained vivianites on natural oxidation. Finer grained vivianites oxidise to an X-ray amorphous state without passing through a triclinic intermediate.

Keywords

X-ray diffractionvivianitemetavivianitebarićite
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 350 , March 1985 , pp. 81 - 85
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985 

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