The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group
The crystal structure of manganotychite has been refined using the holotype specimen from the Alluaiv Mountain, Lovozero massif, Kola peninsula, Russia. The mineral is cubic, Fd3¯, a = 14.0015(3) Å, V = 2744.88(18) Å3, Z = 8, R1 = 0.020 for 388 independently observed reflections. Manganotychite is i...
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ftmdpi:oai:mdpi.com:/2073-4352/13/5/800/ 2023-08-20T04:07:48+02:00 The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group Sergey V. Krivovichev Taras L. Panikorovskii Ayya V. Bazai Mikhail Yu. Sidorov 2023-05-10 application/pdf https://doi.org/10.3390/cryst13050800 EN eng Multidisciplinary Digital Publishing Institute Mineralogical Crystallography and Biomineralization https://dx.doi.org/10.3390/cryst13050800 https://creativecommons.org/licenses/by/4.0/ Crystals; Volume 13; Issue 5; Pages: 800 manganotychite northupite group crystal structure tychite ferrotychite antiperovskite antipyrochlore diamond net structural complexity Text 2023 ftmdpi https://doi.org/10.3390/cryst13050800 2023-08-01T10:01:26Z The crystal structure of manganotychite has been refined using the holotype specimen from the Alluaiv Mountain, Lovozero massif, Kola peninsula, Russia. The mineral is cubic, Fd3¯, a = 14.0015(3) Å, V = 2744.88(18) Å3, Z = 8, R1 = 0.020 for 388 independently observed reflections. Manganotychite is isotypic to tychite and ferrotychite. Its crystal structure is based upon a three-dimensional infinite framework formed by condensation of MnO6 octahedra and CO3 groups by sharing common O atoms. The sulfate groups and Na+ cations reside in the cavities of the octahedral-triangular metal-carbonate framework. In terms of symmetry and basic construction of the octahedral-triangular framework, the crystal structure of manganotychite is identical to that of northupite, Na3Mg(CO3)2Cl. The transition northupite → tychite can be described as a result of the multiatomic 2Cl−→ (SO4)2− substitution, where both chlorine and sulfate ions are the extra-framework constituents. However, the positions occupied by sulfate groups and chlorine ions correspond to different octahedral cavities within the skeletons of Na atoms. The crystal structure of northupite can be considered as an interpenetration of two frameworks: anionic [Mg(CO3)2]2− octahedral-triangular framework and cationic [ClNa3]2− framework with the antipyrochlore topology. Both manganotychite and northupite structure types can be described as a modification of the crystal structure of diamond (or the dia net) via the following steps: (i) replacement of a vertex of the dia net by an M4 tetrahedron (no symmetry reduction); (ii) attachment of (CO3) triangles to the triangular faces of the M4 tetrahedra (accompanied by the Fd3¯m→Fd3¯ symmetry reduction); (iii) filling voids of the resulting framework by Na+ cations (no symmetry reduction); and (iv) filling voids of the Na skeleton by either sulfate groups (in tychite-type structures) or chlorine atoms (in northupite). As a result, the information-based structural complexity of manganotychite and northupite exceeds that of the ... Text kola peninsula MDPI Open Access Publishing Kola Peninsula Lovozero ENVELOPE(35.016,35.016,68.006,68.006) Alluaiv ENVELOPE(34.533,34.533,67.900,67.900) Crystals 13 5 800 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
manganotychite northupite group crystal structure tychite ferrotychite antiperovskite antipyrochlore diamond net structural complexity |
spellingShingle |
manganotychite northupite group crystal structure tychite ferrotychite antiperovskite antipyrochlore diamond net structural complexity Sergey V. Krivovichev Taras L. Panikorovskii Ayya V. Bazai Mikhail Yu. Sidorov The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group |
topic_facet |
manganotychite northupite group crystal structure tychite ferrotychite antiperovskite antipyrochlore diamond net structural complexity |
description |
The crystal structure of manganotychite has been refined using the holotype specimen from the Alluaiv Mountain, Lovozero massif, Kola peninsula, Russia. The mineral is cubic, Fd3¯, a = 14.0015(3) Å, V = 2744.88(18) Å3, Z = 8, R1 = 0.020 for 388 independently observed reflections. Manganotychite is isotypic to tychite and ferrotychite. Its crystal structure is based upon a three-dimensional infinite framework formed by condensation of MnO6 octahedra and CO3 groups by sharing common O atoms. The sulfate groups and Na+ cations reside in the cavities of the octahedral-triangular metal-carbonate framework. In terms of symmetry and basic construction of the octahedral-triangular framework, the crystal structure of manganotychite is identical to that of northupite, Na3Mg(CO3)2Cl. The transition northupite → tychite can be described as a result of the multiatomic 2Cl−→ (SO4)2− substitution, where both chlorine and sulfate ions are the extra-framework constituents. However, the positions occupied by sulfate groups and chlorine ions correspond to different octahedral cavities within the skeletons of Na atoms. The crystal structure of northupite can be considered as an interpenetration of two frameworks: anionic [Mg(CO3)2]2− octahedral-triangular framework and cationic [ClNa3]2− framework with the antipyrochlore topology. Both manganotychite and northupite structure types can be described as a modification of the crystal structure of diamond (or the dia net) via the following steps: (i) replacement of a vertex of the dia net by an M4 tetrahedron (no symmetry reduction); (ii) attachment of (CO3) triangles to the triangular faces of the M4 tetrahedra (accompanied by the Fd3¯m→Fd3¯ symmetry reduction); (iii) filling voids of the resulting framework by Na+ cations (no symmetry reduction); and (iv) filling voids of the Na skeleton by either sulfate groups (in tychite-type structures) or chlorine atoms (in northupite). As a result, the information-based structural complexity of manganotychite and northupite exceeds that of the ... |
format |
Text |
author |
Sergey V. Krivovichev Taras L. Panikorovskii Ayya V. Bazai Mikhail Yu. Sidorov |
author_facet |
Sergey V. Krivovichev Taras L. Panikorovskii Ayya V. Bazai Mikhail Yu. Sidorov |
author_sort |
Sergey V. Krivovichev |
title |
The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group |
title_short |
The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group |
title_full |
The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group |
title_fullStr |
The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group |
title_full_unstemmed |
The Crystal Structure of Manganotychite, Na6Mn2(CO3)4(SO4), and Structural Relations in the Northupite Group |
title_sort |
crystal structure of manganotychite, na6mn2(co3)4(so4), and structural relations in the northupite group |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2023 |
url |
https://doi.org/10.3390/cryst13050800 |
long_lat |
ENVELOPE(35.016,35.016,68.006,68.006) ENVELOPE(34.533,34.533,67.900,67.900) |
geographic |
Kola Peninsula Lovozero Alluaiv |
geographic_facet |
Kola Peninsula Lovozero Alluaiv |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_source |
Crystals; Volume 13; Issue 5; Pages: 800 |
op_relation |
Mineralogical Crystallography and Biomineralization https://dx.doi.org/10.3390/cryst13050800 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/cryst13050800 |
container_title |
Crystals |
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13 |
container_issue |
5 |
container_start_page |
800 |
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1774719685820940288 |