Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation
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...
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| Format: | Article |
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MDPI AG
2018-07-01
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| Series: | Minerals |
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| Online Access: | http://www.mdpi.com/2075-163X/8/7/303 |
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| author | Andrey A. Zolotarev Ekaterina A. Selivanova Sergey V. Krivovichev Yevgeny E. Savchenko Taras L. Panikorovskii Lyudmila M. Lyalina Leonid A. Pautov Victor N. Yakovenchuk |
| author_facet | Andrey A. Zolotarev Ekaterina A. Selivanova Sergey V. Krivovichev Yevgeny E. Savchenko Taras L. Panikorovskii Lyudmila M. Lyalina Leonid A. Pautov Victor N. Yakovenchuk |
| author_sort | Andrey A. Zolotarev |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T07:39:23Z |
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| id | doaj.art-98d108d940bd4d8abc969e2bb8fc2ee1 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-04-13T07:39:23Z |
| publishDate | 2018-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-98d108d940bd4d8abc969e2bb8fc2ee12022-12-22T02:55:58ZengMDPI AGMinerals2075-163X2018-07-018730310.3390/min8070303min8070303Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-InvestigationAndrey A. Zolotarev0Ekaterina A. Selivanova1Sergey V. Krivovichev2Yevgeny E. Savchenko3Taras L. Panikorovskii4Lyudmila M. Lyalina5Leonid A. Pautov6Victor N. Yakovenchuk7Department of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, RussiaGeological Institute, Kola Science Centre, Russian Academy of Sciences, Fersmana 14, 184209 Apatity, RussiaDepartment of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, RussiaGeological Institute, Kola Science Centre, Russian Academy of Sciences, Fersmana 14, 184209 Apatity, RussiaDepartment of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, RussiaGeological Institute, Kola Science Centre, Russian Academy of Sciences, Fersmana 14, 184209 Apatity, RussiaFersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Av. 18/2, 115162 Moscow, RussiaGeological Institute, Kola Science Centre, Russian Academy of Sciences, Fersmana 14, 184209 Apatity, RussiaThe 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.http://www.mdpi.com/2075-163X/8/7/303shkatulkalitetitanosilicatecrystal structureKola PeninsulaLovozero alkaline massiftransformation mineral speciesvuonnemitetitaniumniobium |
| spellingShingle | Andrey A. Zolotarev Ekaterina A. Selivanova Sergey V. Krivovichev Yevgeny E. Savchenko Taras L. Panikorovskii Lyudmila M. Lyalina Leonid A. Pautov Victor N. Yakovenchuk Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation Minerals shkatulkalite titanosilicate crystal structure Kola Peninsula Lovozero alkaline massif transformation mineral species vuonnemite titanium niobium |
| title | Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation |
| title_full | Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation |
| title_fullStr | Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation |
| title_full_unstemmed | Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation |
| title_short | Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation |
| title_sort | shkatulkalite a rare mineral from the lovozero massif kola peninsula a re investigation |
| topic | shkatulkalite titanosilicate crystal structure Kola Peninsula Lovozero alkaline massif transformation mineral species vuonnemite titanium niobium |
| url | http://www.mdpi.com/2075-163X/8/7/303 |
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