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Chemographic exploration of the hyalotekite structure-type

Published online by Cambridge University Press:  28 February 2018

Frank C. Hawthorne ,
Elena Sokolova ,
Atali A. Agakhanov ,
Leonid A. Pautov ,
Vladimir Yu. Karpenko  and
Edward S. Grew
Frank C. Hawthorne*
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
Elena Sokolova
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Science, Leninskii Pr-t, 18/2, Moscow, 117071, Russia
Leonid A. Pautov
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Science, Leninskii Pr-t, 18/2, Moscow, 117071, Russia
Vladimir Yu. Karpenko
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Science, Leninskii Pr-t, 18/2, Moscow, 117071, Russia
Edward S. Grew
Affiliation:
School of Earth and Climate Sciences, University of Maine, Orono, ME 04469, USA
*
*E-mail: frank_hawthorne@umanitoba.ca
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Abstract

The hyalotekite group has been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (memorandum 57–SM/16). The general formula of the minerals of the hyalotekite group may be written as: A2B2M2[Si8T4O28]W where A = Ba2+, Pb2+ or K+; B = Ba2+, Pb2+ or K+; M = Ca2+, Y3+ or REE3+; T = Si4+, B3+ or Be2+; and W = F– or □ (where REE = rare-earth elements and □ = vacancy).

Four minerals are currently known in this group: hyalotekite, Ba4Ca2[Si8B2(SiB)O28]F, triclinic, I$\bar 1$; khvorovite, Pb2+4Ca2[Si8B2(SiB)O28]F, triclinic I$\bar 1$; kapitsaite-(Y), Ba4(YCa)[Si8B2B2O28]F, triclinic, I$\bar 1$; and itsiite Ba4Ca2[Si8B4O28]□, tetragonal, I$\bar 4$2m.

We explore the possible end-member compositions within this group by conflating the properties of an end-member with the stoichiometry imposed by the bond topology of the hyalotekite structure-type and the crystal-chemical properties of its known constituents. There are two high-coordination sites in the hyalotekite structure, A and B, and occupancy of each of these sites can be determined only by crystal-structure refinement. If these two sites are considered together, there are 19 end-member compositions of the triclinic structure and six end-member compositions of the tetragonal structure involving A and B = Ba2+, Pb2+, K+; M = Ca2+, Y3+, REE3+; and T = Si4+, B3+, Be2+. There is the possibility for many other hyalotekite-group minerals, and two potential new minerals have been identified from data in the literature.

Keywords

hyalotekite groupchemographic explorationend-membershyalotekitekhvorovitekapitsaite-(Y)itsiite
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 4 , August 2018 , pp. 929 - 937
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: G. Diego Gatta

References

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