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Structure refinement and crystal chemistry of tokkoite and tinaksite from the Murun massif (Russia)

Published online by Cambridge University Press:  02 January 2018

M. Lacalamita ,
E. Mesto ,
E. Kaneva ,
F. Scordari ,
G. Pedrazzi ,
N. Vladykin  and
E. Schingaro
M. Lacalamita
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari “Aldo Moro”, via E. Orabona 4, I-70125 Bari, Italy
E. Mesto
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari “Aldo Moro”, via E. Orabona 4, I-70125 Bari, Italy
E. Kaneva
Affiliation:
Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Irkutsk-33, Russia 664033
F. Scordari
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari “Aldo Moro”, via E. Orabona 4, I-70125 Bari, Italy
G. Pedrazzi
Affiliation:
Dipartimento di Neuroscienze, Università di Parma, via Volturno 39, I-43100, Parma, Italy
N. Vladykin
Affiliation:
Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Irkutsk-33, Russia 664033
E. Schingaro*
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari “Aldo Moro”, via E. Orabona 4, I-70125 Bari, Italy
*
*E-mail: emanuela.schingaro@uniba.it
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Abstract

The structures of tokkoite, K2Ca4[Si7O18OH](OH,F) and tinaksite, K2Ca2NaTi[Si7O18OH]O from the Murun massif (Russia) were refined from single-crystal X-ray diffraction data in the triclinic space group P1̄. Average crystallographic data are a ≈ 10.423, b ≈ 12.477, c ≈ 7.112 Å, α ≈ 89.92°, β ≈ 99.68°, γ ≈ 92.97°, V ≈ 910.5 Å3 for tokkoite; a ≈ 10.373, b ≈ 12.176, c ≈ 7.057 Å, α ≈ 90.82°, β ≈ 99.22°, γ ≈ 92.80°, V ≈ 878.5 Å3 for tinaksite. The substantial similarities between the geometrical parameters of the tokkoite and tinaksite structures led us to conclude that the two minerals are isostructural. However, major differences of tokkoite with respect to tinaksite are larger lattice constants, especially concerning the b parameter, longer <M–O> distances, especially <M1–O>; larger values of the M1–M3 and O20–O2 bond lengths, and a stronger distortion of the M1 polyhedron. Mössbauer analysis showed that significant trivalent iron is present, VIFe3+ 40.0(7)% in tokkoite and 12.8(3)% in tinaksite. It is confirmed that 2Ca(M1+M2)2+ + (F,OH)(O20)–↔ Ti(M1)4+ + Na(M2)+ + O(O20)– is the exchange reaction that describes the relation between tokkoite and tinaksite. In addition, this exchange reaction causes local stress involving mainly the M1 site and its interaction with the M2 and M3 sites.

Keywords

tinaksitetokkoiteelectron microprobe analysisMössbauer spectroscopysingle-crystal X-ray diffractionpositional disordercrystal chemistry
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 2 , April 2017 , pp. 251 - 272
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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Table 5a. Extra data

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Table 6

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Table 8

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