Vigrishinite, Zn2Ti4 − x Si4O14(OH,H2O,□)8, a new mineral from the Lovozero alkaline complex, Kola Peninsula, Russia

Pekov, Igor V.; Britvin, Sergey N.; Zubkova, N. V.; Чуканов, Н. В.; Bryzgalov, I. A.; Lykova, Inna S.; Belakovskiy, Dmitriy I.; Pushcharovsky, Dmitry Yu.

doi:10.1134/s107570151307009x

Cited by 11 publications

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“…Pekov et al . (2013) and Lykova et al . (2015 b ) compared identical unit cells of vigrishinite and ‘murmanite’ of Rastsvetaeva and Andrianov (1986), designating the latter as “the second triclinic variety of murmanite” [Table 2, unit cell [2] by Rastsvetaeva and Andrianov (1986)].…”

Section: Introductionmentioning

confidence: 95%

“…There is certain disagreement between the crystal-structure refinement results, chemical composition and the chemical formulae of vigrishinite based on the work of Pekov et al . (2013) and Lykova et al . (2015 b ): Lykova et al .…”

Section: Introductionmentioning

confidence: 95%

“…This sample comes from the type locality, Mt. Malyi Punkaruaiv, Lovozero alkaline massif, Kola Peninsula, Russia (Pekov et al ., 2013). From those fragments, we cut five crystals and based on the unit-cell parameters we identified four crystals as vigrishinite and one crystal as zvyaginite, ideally Na 2 ZnTiNb 2 (Si 2 O 7 ) 2 O 2 (OH) 2 (H 2 O) 4 , a lamprophyllite-group mineral (Pekov et al , 2014; Sokolova et al ., 2017).…”

Section: Description Of the Samplementioning

confidence: 99%

“…(2015 b ) stated that their structure-refinement results were better than those of Pekov et al . (2013), and hence the structure information of Lykova et al . (2015 b ) takes precedence over that of Pekov et al .…”

Section: Introductionmentioning

confidence: 97%

“…Vigrishinite was described from Mt. Malyi Punkaruaiv, Lovozero alkaline massif, Kola Peninsula, Russia (Pekov et al ., 2013). They reported its chemical composition (Table 3), the ‘simplified’ formula Zn 2 Ti 4− x (Si 2 O 7 ) 2 (OH,H 2 O,□) 8 ( x < 1) with Z = 2 (Table 2) and its ‘structural model’ ( R 1 = 17.07%).…”

Section: Introductionmentioning

confidence: 99%

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From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi₄(Si₂O₇)₂O₃(OH)(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

Sokolova

Hawthorne

2018

Mineral. mag.

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The crystal structure of vigrishinite, ideally NaZnTi4(Si2O7)2O3(OH)(H2O)4, a murmanite-group mineral of the seidozerite supergroup from the type locality, Mt. Malyi Punkaruaiv, Lovozero alkaline massif, Kola Peninsula, Russia, was refined in space group C$\bar 1$, a = 10.530(2), b = 13.833(3), c = 11.659(2) Å, α = 94.34(3), β = 98.30(3), γ = 89.80(3)°, V = 1675.5(2.1) Å3 and R1 = 12.52%. Based on electron-microprobe analysis, the empirical formula calculated on 22 (O + F), with two constraints derived from structure refinement, OH + F = 1.96 pfu and H2O = 3.44 pfu, is: (Na0.67Zn0.21Ca0.05□1.07)Σ2 (Zn0.86□1.14)Σ2(Zn0.14□0.36)Σ0.5(Ti2.60Nb0.62Mn0.30${\rm Fe}_{{\rm 0}{\rm. 23}}^{{\rm 2 +}} $Mg0.10Zr0.06Zn0.05Al0.03Ta0.01)Σ4(Si4.02O14) [O2.60(OH)1.21F0.19]Σ4[(H2O)3.44(OH)0.56]Σ4{Zn0.24P0.03K0.03Ba0.02} with Z = 4. It seems unlikely that constituents in the {} belong to vigrishinite itself. The crystal structure of vigrishinite is an array of TS blocks (Titanium Silicate) connected via hydrogen bonds. The TS block consists of HOH sheets (H = heteropolyhedral and O = octahedral) parallel to (001). In the O sheet, the Ti-dominant MO(1,2) sites, Na-dominant MO(3) and □-dominant MO(4) sites give ideally Na□Ti2 pfu. In the H sheet, the Ti-dominant MH(1,2) sites, Zn-dominant AP(1) and vacant AP(2) sites give ideally Zn□Ti2 pfu. The MH and AP(1) polyhedra and Si2O7 groups constitute the H sheet. The ideal structural formula of vigrishinite of the form ${\rm A}_{\rm 2}^{P} {\rm M}_{\rm 2}^{\rm H} {\rm M}_{\rm 4}^{\rm O} $(Si2O7)2(${\rm X}_{\rm M}^{\rm O} $)2(${\rm X}_{\rm A}^{\rm O} $)2(${\rm X}_{{\rm M,A}}^{P} $)4 is Zn□Ti2Na□Ti2(Si2O7)2O2O(OH)(H2O)4. Vigrishinite is a Zn-bearing, Na-poor and OH-rich analogue of murmanite, ideally Na2Ti2Na2Ti2(Si2O7)2O2O2(H2O)4. Murmanite and vigrishinite are related by the following substitution: H(${\rm Na}_{\rm 2}^{\rm +} $)mur + O(Na+)mur + O(O2–)mur ↔ H(Zn2+)vig + H(□)vig + O(□)vig + O[(OH)–]vig. The doubling of the t1 and t2 translations of vigrishinite compared to those of murmanite is due to the order of Zn and □ in the H sheet and Na and □ in the O sheet of vigrishinite.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

Section: Description Of the Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi₄(Si₂O₇)₂O₃(OH)(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

Sokolova

Hawthorne

2018

Mineral. mag.

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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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Vigrishinite, Zn2Ti4 − x Si4O14(OH,H2O,□)8, a new mineral from the Lovozero alkaline complex, Kola Peninsula, Russia

Cited by 11 publications

References 4 publications

From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi₄(Si₂O₇)₂O₃(OH)(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi₄(Si₂O₇)₂O₃(OH)(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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Vigrishinite, Zn2Ti4 − x Si4O14(OH,H2O,□)8, a new mineral from the Lovozero alkaline complex, Kola Peninsula, Russia

Cited by 11 publications

References 4 publications

From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi4(Si2O7)2O3(OH)(H2O)4, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi4(Si2O7)2O3(OH)(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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From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi₄(Si₂O₇)₂O₃(OH)(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

From structure topology to chemical composition. XXIV. Revision of the crystal structure and chemical formula of vigrishinite, NaZnTi₄(Si₂O₇)₂O₃(OH)(H₂O)₄, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia