The new mineral elasmochloite, Na3Cu6BiO4(SO4)5, was found in the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with tenorite, hematite, langbeinite, aphthitalite, krasheninnikovite and johillerite. Elasmochloite occurs as lamellar crystals flattened on {001}, up to 0.005 × 0.07 × 0.1 mm in size, separate or combined into open-work clusters up to 0.3 mm across. It is transparent, green, with vitreous lustre. The calculated density (Dcalc) is 3.844 g cm−3. Elasmochloite is optically uniaxial or pseudo-unixial (−), α = 1.611(2), β = γ = 1.698(2), 2 V ≈ 0°. Pleochroism is strong, Z ≈ Y (grass-green) > X (turquoise-blue). The chemical composition obtained by electron-microprobe analysis is (in wt%): Na2O 6.67, K2O 0.82, CuO 38.77, ZnO 0.25, PbO 3.17, Bi2O3 17.66, SO3 32.81, total 100.15. The empirical formula based on 24 O atoms per formula unit (apfu) is Na2.63K0.21Cu5.96Zn0.04Pb0.17Bi0.93S5.01O24. Elasmochloite is monoclinic, P21/n, a 10.1273(9), b 10.1193(8), c 21.1120(16) Å, β 102.272(8)°, V 2114.1(3) Å3 and Z = 4. The strongest reflections of the powder X-ray diffraction (XRD) pattern [d, Å(I)(hkl)] are: 10.33(100)(002), 7.04(18)(110, ), 6.33(14)(111, 12), 3.576(24)(21), 2.920(14)(25), 2.529(14)(02, 040) and 2.460(14)(27). The crystal-structure model was obtained from single-crystal XRD data, R1 = 20.6%. It contains two types of alternating polyhedral layers: (1) “copper-bismuth slabs” composed by [BiO4O2] polyhedra, [CuO5] square pyramids and [CuO4] squares and (2) “sodium slabs” consisting of [NaO5] and [NaO6] polyhedra. Corner-sharing [SO4] tetrahedra integrate cationic polyhedra into the whole structure. In an anion-centred approach, the structure can be expressed as a stacking of perforated layers composed of [Cu8BiO4] “half-cube” clusters interleaved with [SO4] tetrahedra and Na cations. Elasmochloite belongs to a novel structure type but has some common structural features with nabokoite KCu7Te4+O4(SO4)5Cl and favreauite PbCu6BiO4(Se4+O3)4(OH)·H2O. The mineral name is based on the Greek words έλασμα, lamella, and χλόη, the green shoot, in allusion to the green colour and lamellar crystal habit.
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Research Article|
September 01, 2019
Elasmochloite, Na3Cu6BiO4(SO4)5, a new fumarolic mineral from the Tolbachik volcano, Kamchatka, Russia
Igor V. Pekov;
1
Faculty of Geology, Moscow State University
, Vorobievy Gory, 119991Moscow, Russia
Corresponding author, e-mail: [email protected]
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Sergey N. Britvin;
Sergey N. Britvin
2
Department of Crystallography, St. Petersburg State University
, University Embankment 7/9, 199034St. Petersburg, Russia
3
Kola Science Center of Russian Academy of Sciences
, Fersman Str. 14, 184200Apatity, Russia
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Atali A. Agakhanov;
Atali A. Agakhanov
4
Fersman Mineralogical Museum of Russian Academy of Sciences
, Leninsky Prospekt 18-2, 119071Moscow, Russia
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Marina F. Vigasina;
Marina F. Vigasina
1
Faculty of Geology, Moscow State University
, Vorobievy Gory, 119991Moscow, Russia
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Evgeny G. Sidorov
Evgeny G. Sidorov
5
Institute of Volcanology and Seismology, Far Eastern Branch of Russian Academy of Sciences
, Piip Boulevard 9, 683006Petropavlovsk-Kamchatsky, Russia
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Sergey N. Britvin
2
Department of Crystallography, St. Petersburg State University
, University Embankment 7/9, 199034St. Petersburg, Russia
3
Kola Science Center of Russian Academy of Sciences
, Fersman Str. 14, 184200Apatity, Russia
Atali A. Agakhanov
4
Fersman Mineralogical Museum of Russian Academy of Sciences
, Leninsky Prospekt 18-2, 119071Moscow, Russia
Marina F. Vigasina
1
Faculty of Geology, Moscow State University
, Vorobievy Gory, 119991Moscow, Russia
Evgeny G. Sidorov
5
Institute of Volcanology and Seismology, Far Eastern Branch of Russian Academy of Sciences
, Piip Boulevard 9, 683006Petropavlovsk-Kamchatsky, Russia
Corresponding author, e-mail: [email protected]
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
20 May 2019
Revision Received:
16 Jul 2019
Accepted:
25 Jul 2019
First Online:
09 Sep 2019
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2019 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germany
European Journal of Mineralogy (2019) 31 (5-6): 1025–1032.
Article history
Received:
20 May 2019
Revision Received:
16 Jul 2019
Accepted:
25 Jul 2019
First Online:
09 Sep 2019
Citation
Igor V. Pekov, Sergey N. Britvin, Atali A. Agakhanov, Marina F. Vigasina, Evgeny G. Sidorov; Elasmochloite, Na3Cu6BiO4(SO4)5, a new fumarolic mineral from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy 2019;; 31 (5-6): 1025–1032. doi: https://doi.org/10.1127/ejm/2019/0031-2887
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Index Terms/Descriptors
- Asia
- cell dimensions
- chemical composition
- color
- Commonwealth of Independent States
- crystal chemistry
- crystal structure
- electron probe data
- formula
- fumaroles
- habit
- Kamchatka Peninsula
- Kamchatka Russian Federation
- morphology
- new minerals
- optical properties
- physical properties
- pleochroism
- Raman spectra
- Russian Federation
- spectra
- sulfates
- Tolbachik
- volcanoes
- X-ray diffraction data
- Great Tolbachik Fissure
- Northern Breakthrough
- Arsenatnaya fumarole
- elasmochloite
Latitude & Longitude
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