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Zeolitic water in strunzite-group minerals

Published online by Cambridge University Press:  28 February 2018

Ian E. Grey  and
Anthony R. Kampf
Ian E. Grey*
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton, 3169, Victoria, Australia
Anthony R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
*
*E-mail: ian.grey@csiro.au
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Abstract

The crystal structures have been refined for the first time for the strunzite-group minerals ferristrunzite and ferrostrunzite. Structure refinements are also presented for strunzite from three different localities. A common feature of all refined structural models is the presence of zeolitic water in the interlayer region, displaced by 0.4–0.5 Å from an inversion centre at (½ 0 ½). The refined occupancy of the site ranged from 44% to 100% in the samples studied. H-bonding associated with the zeolitic water causes large displacements, up to 0.7 Å, of neighbouring coordinated water molecules, relative to the structure with no zeolitic water. A new formula is proposed for strunzite-group minerals with divalent interlayer cations as M2+ Fe23+(PO4)2(OH)2·(6.5–x)H2O where M = Mn, Fe or Zn, and 0 < x < 0.5 accounts for varying degrees of dehydration. For ferristrunzite and other potential strunzite-group members with trivalent cations in the interlayer octahedron, the formula is M3+ Fe23+ (PO4)2(OH)3·(5.5–x)H2O.

Keywords

zeolitic waterstrunzite-group mineralsferristrunziteferrostrunzite
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 2 , April 2018 , pp. 291 - 299
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Ian Graham

References

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