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The crystal structure of parahopeite

Published online by Cambridge University Press:  14 March 2018

Isik Kumbasar  and
J. J. Finney
Isik Kumbasar
Affiliation:
Geology Department, Colorado School of Mines, Golden, Colorado, U.S.A.
J. J. Finney
Affiliation:
Geology Department, Colorado School of Mines, Golden, Colorado, U.S.A.
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Summary

Parahopeite, Zn3(PO4)2.4H2O, is the triclinic dimorph of hopeite. The crystal structure of parahopeite has been determined to be similar to phosphophyllite, Zn2Fe(PO4)2.4H2O and to hopeite in that one of the two zinc atoms is six-coordinated and the other is four-coordinated. Parahopeite differs from the other two minerals though because one of the P-O tetrahedral oxygen atoms is bonded to both the six- and the four-coordinated cations. That is, all four tetrahedral oxygen atoms are bonded to the four-coordinated zinc in parahopeite, whereas in phosphophyllite and hopeite only three of these oxygen atoms are so bonded.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 281 , March 1968 , pp. 621 - 624
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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