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New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. VII. Pharmazincite, KZnAsO4

Published online by Cambridge University Press:  02 January 2018

Igor V. Pekov ,
Vasiliy O. Yapaskurt ,
Dmitry I. Belakovskiy ,
Marina F. Vigasina ,
Natalia V. Zubkova  and
Evgeny G. Sidorov
Igor V. Pekov*
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
Vasiliy O. Yapaskurt
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
Dmitry I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Marina F. Vigasina
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
Natalia V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
Evgeny G. Sidorov
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006 Petropavlovsk-Kamchatsky, Russia
*
*E-mail: [email protected]
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Abstract

The new mineral pharmazincite, KZnAsO4, was found in sublimates of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is closely associated with shchurovskyite, dmisokolovite, bradaczekite, arsmirandite, tilasite, johillerite, tenorite, hematite, aphthitalite and As-bearing orthoclase. Pharmazincite occurs as prismatic to acicular crystals up to 1 mm long and up to 0.03 mm thick typically combined in near parallel, radial or chaotic intergrowths, open-work aggregates or crusts up to 2 mm across. Pharmazincite is colourless to white, transparent, with a vitreous lustre. It is brittle, with a stepped fracture and a perfect cleavage parallel to [001]. Dcalc is 4.75 g cm–3. Pharmazincite is optically uniaxial (–),ω = 1.649(2), ε = 1.642(2). The Raman spectrum is reported. The chemical composition (wt.%, electron-microprobe data) is: K2O 18.98, CaO 0.14, MgO 1.20, CuO 4.41, ZnO 27.58, Fe2O3 0.15, P2O5 0.50, As2O546.67, total 99.63. The empirical formula, calculated based on 4 O apfu, is: (K0.97Ca0.01)∑0.98(Zn0.82Cu0.13Mg0.07Fe0.013+)∑1.03(As0.98P0.02)∑1.00O4.The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 6.36 (28)(111), 4.64(45)(220), 4.35(48)(002), 3.260(36)(411), 3.179(100)(222), 2.770(26)(113), 2.676(77)(600), 2.278(15)(602) and 1.710(15)(713, 115). Pharmazincite is hexagonal, a = 18.501(4), c = 8.7114(9) Å, V = 2582.4(8) Å3 and Z = 24 (single-crystal XRD data). Its space group is P63, by analogy with synthetic KZnAsO4 that has a crystal structure based upon a tetrahedral tridymite-type{ZnAsO4}– framework. It is isostructural with megakalsilite KAlSiO4. The new mineral is named for its chemical constituents.

Keywords

pharmazincitenew mineralpotassium zinc arsenatetridymite tetrahedral frameworkfumarole sublimateTolbachik volcanoKamchatka
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 4 , August 2017 , pp. 1001 - 1008
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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References

Andratschke, M., Range, K.J., Haase, H. and Klement, U. (1992) Die Kristallstruktur von α-KZnPO4 . Zeitschrift für Naturforschung, Teil B. Anorganische Chemie, organische Chemie, 47, 1249–1254.Google Scholar
Averbuch-Pouchot, M.T. and Durif, A. (1973) Donnees cristallographiques sur ZnKPO4 et ZnKAsO4 . Materials Research Bulletin, 8, 353–356.CrossRefGoogle Scholar
Buerger, M.J. (1954) The stuffed derivatives of the silica structures. American Mineralogist, 39, 600–614.Google Scholar
Colbeau-Justin, C. (1996) Cristallochimie et proprietes non linearies de nouveaux composes a structures cristobalite et tridymite deformees. PhD thesis, Universit de Paris 6, Paris.Google Scholar
Gregorkiewitz, M. (1986) Alkali ion diffusion in M (AlSiO4) compounds with frameworks of the tridymite topology and its variations. Solid State Ionics, 18–19, 534–538.CrossRefGoogle Scholar
Khomyakov, A.P., Nechelyustov, G.N., Sokolova, E.V., Bonaccorsi, E., Merlino S. and Pasero, M. (2002) Megakalsilite, a new polymorph of KAlSiO4 from the Khibina massif, Kola Peninsula, Russia: mineral description and crystal structure. The Canadian Mineralogist, 40, 961–970.CrossRefGoogle Scholar
Koshlyakova, N.N., Pekov, I.V., Yapaskurt, V.O. and Sidorov, E.G. (2014) Arsenic-bearing potassic feldspar-a product of fumarolic exhalations and gas metasomatism at the Tolbachik volcano (Kamchatka, Russia). Pp. 55–56 in: International Conference “Ore Potential of Alkaline, Kimberlite and Carbonatite Magmatism ”, GEOKHI RAS, Moscow.Google Scholar
Mandarino, J.A. (1981) The Gladstone-Dale relationship. Part IV The compatibility concept and its application. The Canadian Mineralogist, 14, 498–502.Google Scholar
Pekov, LY, Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Lykova, I.S., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Yu. (2014a) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. I. Yurmarinite, Na7(Fe3+, Mg,Cu)4(AsO4)6. Mineralogical Magazine, 78, 905–917.CrossRefGoogle Scholar
Pekov, LY, Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Yu. (2014b) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. II. Ericlaxmanite and kozyrevskite, two natural modifications of Cu4O(AsO4)2. Mineralogical Magazine, 78, 1527–1543.Google Scholar
Pekov, LY, Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Yu. (2015a) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. III. Popovite, Cu5O2(AsO4)2. Mineralogical Magazine, 79, 133–143.CrossRefGoogle Scholar
Pekov, LY, Zubkova, N.V., Belakovskiy, D.I., Yapaskurt, V.O., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Yu. (2015b) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. IV Shchurovskyite, K2CaCu6O2(AsO4)4 and dmisokolovite, K3Cu5AlO2 (AsO4)4. Mineralogical Magazine, 79, 1737–1753.CrossRefGoogle Scholar
Pekov, LY, Yapaskurt, V.O., Britvin, S.N., Zubkova, N.V., Vigasina, M.F. and Sidorov, E.G. (2016a) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. Y Katiarsite, KTiO(AsO4). Mineralogical Magazine, 80, 639–646.CrossRefGoogle Scholar
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Polekhovsky, Yu.S., Vigasina, M.F., Belakovskiy, D.I., Britvin, S.N., Sidorov, E.G. and Pushcharovsky, D.Yu. (2016b) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. VI. Melanarsite, K3Cu7Fe +O4(AsO4)4. Mineralogical Magazine, 80, 855–867.CrossRefGoogle Scholar
Sandomirskii, P.A., Meshalkin, S.S., Rozhdestvenskaya, LY, Dem'yanets, L.N. and Uvarova, T.G. (1986) Crystal structures of the D-phase of KAlGeO4 and the C-phase of NaAlGeO4 . Soviet Physics, Crystallography, 31, 522–527.Google Scholar