Zvyaginite, NaZnNb2Ti[Si2O7]2O(OH,F)3(H2O)4 + x
               (x &lt; 1), a new mineral of the epistolite group from the Lovozero Alkaline Pluton, Kola Peninsula, Russia

Pekov, Igor V.; Lykova, Inna S.; Чуканов, Н. В.; Yapaskurt, Vasiliy O.; Belakovskiy, Dmitriy I.; Zolotarev, Andrey A.; Zubkova, N. V.

doi:10.1134/s1075701514080066

Cited by 10 publications

(28 citation statements)

References 8 publications

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“…The chemical composition of zvyaginite is the mean of 3 determinations and is given in Table 2. Our chemical analysis of zvyaginite is close to that of Pekov et al (2014) except for the higher Na 2 O content 7.10 vs 4.74 wt.% (Pekov et al, 2014) (Table 2).…”

Section: Chemical Analysissupporting

confidence: 62%

“…We collected single-crystal X-ray data for zvyaginite crystals #1, #2 and #3 and refined their crystal structures using atom coordinates of Pekov et al (2014) to R 1 = 15.78, 14.28 and 12.69%, respectively. However, we encountered the same problems that we outlined above: the ratios of U eq for cations at the Nb(1) and Nb(2) sites and Zn(1) and Zn(2) sites were 3:1 and 1:3, respectively; [6] Zn 2-O(6) = 2.88 Å.…”

Section: X-ray Data Collection and Structure Refinementmentioning

confidence: 99%

“…We used direct methods to find another solution and were able to refine the structure in space group P ⎯1 to R 1 = 9.22% (Table 4). Our new structure had a different origin when compared to the structure of Pekov et al (2014) and was free of the problems outlined above. However we felt that the refinement of the structure of zvyaginite using unit-cell based on t 1 and t 2 translations would give us an opportunity to better understand the relation between zvyaginite and all other TS-block structures, especially epistolite.…”

Section: X-ray Data Collection and Structure Refinementmentioning

confidence: 99%

“…Zvyaginite was described from the Lovozero alkaline massif, Kola Peninsula, Russia by Pekov et al (2014). They reported a structural model for zvyaginite: space group P ⎯1, a = 8.975 3 3, γ = 89.98(3)°, V = 455.4(5) Å 3 , R 1 = 9.8%, Sokolova and Hawthorne (2004)] are topologically identical but differ in composition of the O sheet in the HOH block, where partial substitution of Zn 2+ for Na + occurs.…”

Section: Introductionmentioning

confidence: 99%

“…We considered the crystal structure of zvyaginite (Pekov et al, 2014) and found some unresolved problems:…”

Section: Introductionmentioning

confidence: 99%

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From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na₂ZnTiNb₂(Si₂O₇)₂O₂(OH)₂(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

et al. 2017

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The crystal structure and chemical formula of zvyaginite, ideally Na2ZnTiNb2(Si2O7)2O2(OH)2(H2O)4, a lamprophyllite-group mineral of the seidozerite supergroup from the type locality, Mt. Malyi Punkaruaiv, Lovozero alkaline massif, Kola Peninsula, Russia have been revised. The crystal structurewas refined with a new origin in space group C1, a = 10.769(2), b = 14.276(3), c = 12.101(2) Å, α = 105.45(3), β = 95.17(3), γ = 90.04(3)°, V = 1785.3(3.2) Å3, R1 = 9.23%. The electron-microprobe analysis gave the following empirical formula [calculated on 22 (O + F)]: (Na0.75Ca0.09K0.04□1.12)Σ2 (Na1.12Zn0.88Mn0.17Fe2+0.04□0.79)Σ3 (Nb1.68Ti1.25Al0.07)Σ3 (Si4.03O14)O2 [(OH)1.11F0.89]Σ2(H2O)4, Z = 4. Electron-diffraction patterns have prominent streaking along c* and HRTEM images show an intergrowth of crystalline zvyaginite with two distinct phases, both of which are partially amorphous. The crystal structure of zvyaginite is an array of TS (Titanium-Silicate) blocks connected via hydrogen bonds between H2O groups. The TS block consists of HOH sheets (H = heteropolyhedral, O = octahedral) parallel to (001). In the O sheet, the [6]MO(1,4,5) sites are occupied mainly by Ti, Zn and Na and the [6]MO(2,3) sites are occupied by Na at less than 50%. In the H sheet, the [6]MH(1,2) sites are occupied mainly by Nb and the [8]AP(1) and [8]AP(2) sites are occupied mainly by Na and □. The MH and AP polyhedra and Si2O7 groups constitute the H sheet. The ideal structural formula is Na□Nb2NaZn□Ti(Si2O7)2O2(OH)2(H2O)4. Zvyaginite is a Zn-bearing and Na-poor analogue of epistolite, ideally (Na□)Nb2Na3Ti(Si2O7)2O2(OH)2(H2O)4. Epistolite and zvyaginite are related by the following substitution in the O sheet of the TS-block: (Naþ 2 )epi↔Zn2+ zvy +□zvy. The doubling of the t1 and t2 translations of zvyaginite relative to those of epistolite is due to the order of Zn and Na along a (t1) and b (t2) in the O sheet of zvyaginite.

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Section: Chemical Analysissupporting

confidence: 62%

Section: X-ray Data Collection and Structure Refinementmentioning

confidence: 99%

Section: X-ray Data Collection and Structure Refinementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…We considered the crystal structure of zvyaginite (Pekov et al, 2014) and found some unresolved problems:…”

Section: Introductionmentioning

confidence: 99%

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From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na₂ZnTiNb₂(Si₂O₇)₂O₂(OH)₂(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

et al. 2017

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The Discovery of New Minerals in Modern Mineralogy: Experience, Implications and Perspectives

Pekov

Pushcharovsky

2023

Springer Mineralogy

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Crystal chemistry of a Ba-dominant analogue of hydrodelhayelite and natural ion-exchange transformations in double- and triple-layer phyllosilicates in post-volcanic systems of the Eifel region, Germany

et al. 2016

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A b s t r a c t A B a -d o m i n a n t ( B a > K ) a n a l o g u e o f hydrodelhayelite (BDAH) from Löhley (Eifel Mts., Rhineland-Palatinate, Germany) and Ba-enriched varieties of related double-and triple-layer phyllosilicates from Eifel are studied. The crystal structure of BDAH was solved by direct methods and refined to R = 0.0698 [1483 unique reflections with I > 2σ(I)]. It is orthorhombic, Pmmn, a = 23.9532(9), b = 7.0522(3), c = 6.6064(3) Å, V = 1115.97(8) Å 3 , Z = 2. The structure is based upon delhayelite-type double-layer tetrahedral blocks [(Al, Si) 4 Si 12 O 34 (OH,O) 4 ] connected by chains of (Ca,Fe)-centered octahedra. Ba 2+ and subordinate K + occur at partially vacant sites in zeolitic channels within the tetrahedral blocks. The crystal-chemical formula of BDAH is: ( B a 0 . 4 2 K 0 . 3 4 □ 0 . 2 4 ) ( C a 0 . 8 8 F e 0 . 1 2 ) 2 ( □ 0 . 9 0 M g 0 . 1 0 ) 2 [Si 6 (Al 0.5 Si 0.5 ) 2 O 17 (OH 0.71 O 0.29 ) 2 ]⋅6H 2 O. The formation of BDAH and Ba-rich varieties of altered delhayelite/ fivegite, günterblassite and hillesheimite is considered as a result of leaching of Na, Cl, F and, partially, K and Ca accompanied with hydration and the capture of Ba as a result of natural ion exchange. These minerals are structurally a Bbridge^between single-layer phyllosilicates and zeolites having the open three-dimensional tetrahedral Al-Si-O frameworks. IntroductionDouble-and triple-layer phyllosilicates belonging to the rhodesite mero-plesiotype series (Ferraris and Gula 2005) and the günterblassite group, respectively, have crystal structures and chemical properties that are extraordinary in comparison with the majority of natural silicates. These minerals are not common in nature but, as our recent data show, they are typical components of some assemblages related to Late Pleistocene alkaline basalts of the Eifel volcanic region, Rhineland-Palatinate, Germany. In particular, unusual barium-rich samples of these double-and triple-layer phyllosilicates have been found there, with convincing evidence that they are products of natural ion exchange. This is a matter of the present paper.

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Zvyaginite, NaZnNb2Ti[Si2O7]2O(OH,F)3(H2O)4 + x (x < 1), a new mineral of the epistolite group from the Lovozero Alkaline Pluton, Kola Peninsula, Russia

Cited by 10 publications

References 8 publications

From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na₂ZnTiNb₂(Si₂O₇)₂O₂(OH)₂(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na₂ZnTiNb₂(Si₂O₇)₂O₂(OH)₂(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

The Discovery of New Minerals in Modern Mineralogy: Experience, Implications and Perspectives

Crystal chemistry of a Ba-dominant analogue of hydrodelhayelite and natural ion-exchange transformations in double- and triple-layer phyllosilicates in post-volcanic systems of the Eifel region, Germany

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Zvyaginite, NaZnNb2Ti[Si2O7]2O(OH,F)3(H2O)4 + x (x < 1), a new mineral of the epistolite group from the Lovozero Alkaline Pluton, Kola Peninsula, Russia

Cited by 10 publications

References 8 publications

From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na2ZnTiNb2(Si2O7)2O2(OH)2(H2O)4, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na2ZnTiNb2(Si2O7)2O2(OH)2(H2O)4, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

The Discovery of New Minerals in Modern Mineralogy: Experience, Implications and Perspectives

Crystal chemistry of a Ba-dominant analogue of hydrodelhayelite and natural ion-exchange transformations in double- and triple-layer phyllosilicates in post-volcanic systems of the Eifel region, Germany

Contact Info

Product

Resources

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From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na₂ZnTiNb₂(Si₂O₇)₂O₂(OH)₂(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na₂ZnTiNb₂(Si₂O₇)₂O₂(OH)₂(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia