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Minerals 2018, 8(7), 303; https://doi.org/10.3390/min8070303

Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation

1
Department of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
2
Geological Institute, Kola Science Centre, Russian Academy of Sciences, Fersmana 14, 184209 Apatity, Russia
3
Nanomaterials Research Centre, Kola Science Centre, Russian Academy of Sciences, Fersmana 14, 184209 Apatity, Russia
4
Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Av. 18/2, 115162 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 18 May 2018 / Revised: 5 July 2018 / Accepted: 12 July 2018 / Published: 18 July 2018
(This article belongs to the Special Issue Arctic Mineral Resources: Science and Technology)
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Abstract

The crystal structure of shkatulkalite has been solved from the crystal from the Lovozero alkaline massif, Kola Peninsula, Russia. The mineral is monoclinic, P2/m, a = 5.4638(19), b = 7.161(3), c = 15.573(6) Å, β = 95.750(9)°, V = 606.3(4) Å3, R1 = 0.080 for 1551 unique observed reflections. The crystal structure is based upon the HOH blocks consisting of one octahedral (O) sheet sandwiched between two heteropolyhedral (H) sheets. The blocks are parallel to the (001) plane and are separated from each other by the interlayer space occupied by Na1 atoms and H2O groups. The Na2, Na3, and Ti sites are located within the O sheet. The general formula of shkatulkalite can be written as Na5(Nb1−xTix)2(Ti1−yMn2+y)[Si2O7]2O2(OH)2·nH2O, where x + y = 0.5 and x ≈ y ≈ 0.25 for the sample studied. Shkatulkalite belongs to the seidozerite supergroup and is a member of the lamprophyllite group. The species most closely related to shkatulkalite are vuonnemite and epistolite. The close structural relations and the reported observations of pseudomorphs of shkatulkalite after vuonnemite suggest that, at least in some environments, shkatulkalite may form as a transformation mineral species. View Full-Text
Keywords: shkatulkalite; titanosilicate; crystal structure; Kola Peninsula; Lovozero alkaline massif; transformation mineral species; vuonnemite; titanium; niobium shkatulkalite; titanosilicate; crystal structure; Kola Peninsula; Lovozero alkaline massif; transformation mineral species; vuonnemite; titanium; niobium
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zolotarev, A.A., Jr.; Selivanova, E.A.; Krivovichev, S.V.; Savchenko, Y.E.; Panikorovskii, T.L.; Lyalina, L.M.; Pautov, L.A.; Yakovenchuk, V.N. Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation. Minerals 2018, 8, 303.

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