Cation ordering in zvyaginite: new data on composition and structure

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Abstract

A new modification of zvyagignite from agpaitic pegmatite at Mt. Kuamdespakhk, Lovozero massif, Kola Peninsula, was studied. It is triclinic, space P-1. a = 5.4141(2), b = 7.1410(6), c = 12.0831(12) Å, α = 104.963(8), β = 95.294(6), γ = 90.048(5)°, V = 449.24(6) Å3. This zvyaginite modification is formed by natural cation exchange reaction 2Na+ ↔ □ + Zn2+ and inherit unit cell parameters from epistolite. This modification of zvyaginite is considered as disordered, or zvyaginite-1Tc, in contrast to the previously known modification with doubled unit cell volume (ordered modification, or zvyaginite-2Tc) In the disordered modification of zvyaginite Zn2+ incorporates exclusively at the octahedral layer, whereas the formation of ordered zvyaginite can be associated with a greater exchange completeness, when Zn2+ incorporates at heteropolyhedral layer, where it’s even a small admixture is sufficient to change the geometry of Si2O7 groups and doubling of unit cell parameters. Variations in the chemical composition of zvyaginite allow us to propose for it a generalized formula Na2-хZnNb2Ti(Si2O7)2[(OH)2+xO2-x]⸱4H2O (0 ≤ x ≤ 1).

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T. L. Panikorovskii

Kola Science Centre RAS; Saint Petersburg State University

Author for correspondence.
Email: t.panikorovskii@ksc.ru

Д. чл., Санкт-Петербургский государственный университет, кафедра кристаллографии

Russian Federation, Apatity; Saint Petersburg

O. F. Goychuk

Kola Science Centre RAS

Email: t.panikorovskii@ksc.ru
Russian Federation, Apatity

V. N. Yakovenchuk

Kola Science Centre RAS

Email: t.panikorovskii@ksc.ru

д. чл.

Russian Federation, Apatity

A. N. Gosteva

Chemistry KSC RAS; Murmansk Arctic University

Email: t.panikorovskii@ksc.ru

I.V. Tananaev Institute of Chemistry KSC RAS

Russian Federation, Apatity; Murmansk

I. V. Pekov

Moscow State University

Email: t.panikorovskii@ksc.ru

почетный член, Геологический факультет

Russian Federation, Moscow

S. V. Krivovichev

Kola Science Centre RAS; Saint Petersburg State University

Email: t.panikorovskii@ksc.ru

д. чл., Санкт-Петербургский государственный университет, кафедра кристаллографии

Russian Federation, Apatity; Saint Petersburg

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Supplementary files

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2. Fig. 1. Location of the Lovozero massif at Kola peninsula and geological scheme of the Lovozero massif with marked location of the pegmatite at Mt. Kuamdespakhk.

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3. Fig. 2. Lamellae of zvyaginite (1) in ussingite (2) with gonnardite (3) and characteristic voids after leached sphalerite partially filled by orange sauconite (4). The pegmatite at Mt. Kuamdespakhk, Lovozero massif.

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4. Fig. 3. Infrared spectrum of zvyaginite from the pegmatite at Mt. Kuamdespakhk, Lovozero massif.

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5. Fig. 4. Reconstructed sections of reciprocal space obtained for zvyaginite:(hk0) — a and(h0l) — б.

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6. Fig. 5. Crystal structure of zvyaginite from pegmatite at Mt. Kuamdespakhk, Lovozero massif: general projection (a), projection of (O) octahedral sheet (б), projection of (H) heteropolyhedral sheet (в). General projection of the ordered structure of zvyaginite according to (Pekov et al., 2014) (г), local coordination of Na in disordered zvyaginite (д); relationship between unit cells of ordered (dashed line) and disordered (solid line) zvyaginite (е).

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7. Fig. 6. Projection(H) of heteropolyhedral layer of zvyaginite: from pegmatite at Mt. Kuamdespakhk (a), zvyaginite from (Pekov et al., 2014) (б), vigrishinite from (Lykova et al., 2015) (в), Lovozero massif.

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