Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-08T07:26:02.521Z Has data issue: false hasContentIssue false
  • English
  • Français

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. II. Ericlaxmanite and kozyrevskite, two natural modifications of Cu4O(AsO4)2

Published online by Cambridge University Press:  05 July 2018

I. V. Pekov ,
N. V. Zubkova ,
V. O. Yapaskurt ,
D. I. Belakovskiy ,
M. F. Vigasina ,
E. G. Sidorov  and
D. Yu. Pushcharovsky
I. V. Pekov*
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
N. V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
V. O. Yapaskurt
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
D. I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
M. F. Vigasina
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
E. G. Sidorov
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Bulevard 9, 683006 Petropavlovsk-Kamchatsky, Russia
D. Yu. Pushcharovsky
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
*
* E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Two new minerals, ericlaxmanite and kozyrevskite, dimorphs of Cu4O(AsO4)2, were 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. They are associated with each other and with urusovite, lammerite, lammerite-b, popovite, alarsite, tenorite, hematite, aphthitalite, langbeinite, As-bearing orthoclase, etc. Ericlaxmanite occurs as tabular, lamellar, equant or short prismatic crystals up to 0.1 mm in size, their clusters and pseudomorphs after urusovite crystal crusts up to 1.5 cm × 2 cm in area. Kozyrevskite occurs as prismatic crystals up to 0.3 mm long in clusters and as individual crystals. Both minerals are transparent with a vitreous lustre. They are brittle, with Mohs’ hardness ~3–. Ericlaxmanite is green to dark green. Kozyrevskite is bright grass green to light yellowish green; Dcalc is 5.036 (ericlaxmanite) and 4.934 (kozyrevskite) g cm–3. Both minerals are optically biaxial (–); ericlaxmanite: α = 1.870(10), β = 1.900(10), γ = 1.915(10), 2Vmeas = 60(15)º; kozyrevskite: α = 1.885(8), β = 1.895(8), γ = 1.900(8), 2Vmeas. = 75(10)º. The Raman spectra are given. Chemical data (wt.%, electron microprobe; the first value is for ericlaxmanite, the second for kozyrevskite): CuO 57.55, 58.06; ZnO 0.90, 1.04; Fe2O3 0.26, 0.12; SiO2 n.d., 0.12; P2O5 0.23, 1.23; V2O5 0.14, 0.37; As2O5 40.57, 38.78; SO3 0.17, 0.43; total 99.82, 100.15. The empirical formulae, based on 9 O a.p.f.u., are: ericlaxmanite: (Cu3.97Zn0.06Fe0.02)Σ4.05(As1.94P0.02V0.01S0.01)Σ1.98O9 and kozyrevskite: (Cu3.95Zn0.07Fe0.01)Σ4.03(As1.83P0.09S0.03V0.02Si0.01)Σ1.98O9. Ericlaxmanite is triclinic, P, a = 6.4271(4), b = 7.6585(4), c = 8.2249(3) Å , α = 98.396(4), β = 112.420(5), γ = 98.397(5)º, V = 361.11(3) Å3 and Z = 2. Kozyrevskite is orthorhombic, Pnma, a = 8.2581(4), b = 6.4026(4), c = 13.8047(12) Å , V = 729.90(9) Å3 and Z = 4. The strongest reflections in the X-ray powder patterns [d Å (I)(hkl)] are: ericlaxmanite: 3.868(46)(101), 3.685(100)(020), 3.063(71)(012), 2.957(58)(02), 2.777(98)(12, 1), 2.698(46)(2) and 2.201(51)(013, 031); kozyrevskite: 3.455(100)(004), 3.194(72)(020, 104), 2.910(69)(022), 2.732(82)(122), 2.712(87)(301) and 2.509(92)(123). Their crystal structures, solved from single-crystal X-ray diffraction data [R = 0.0358 (ericlaxmanite) and 0.1049 (kozyrevskite)], are quite different. The ericlaxmanite structure is based on an interrupted framework built by edge- and corner-sharing Cu-centred, distorted tetragonal pyramids, trigonal bipyramids and octahedra. The kozyrevskite structure is based on complicated ribbons of Cu-centred distorted tetragonal pyramids and trigonal bipyramids. Ericlaxmanite is named in honour of the Russian mineralogist, geologist, geographer, biologist and chemist Eric Laxman (1737–1796). Kozyrevskite is named in honour of the Russian geographer, traveller and military man Ivan Petrovich Kozyrevskiy (1680–1734), one of the first researchers of Kamchatka.

Keywords

ericlaxmanitekozyrevskitenew mineralcopper arsenatecrystal structurefumarolic sublimateTolbachik volcanoKamchatka.
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 7 , December 2014 , pp. 1553 - 1569
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Adams, R.D., Layland, R. and Payen, C. (1995) Cu4(AsO4)2(O): a new copper arsenate with unusual low temperature magnetic properties. Inorganic Chemistry, 34, 5397–5398.CrossRefGoogle Scholar
Anderson, J.B., Shoemaker, G.L. and Kostiner, E. (1978) The crystal structure of Cu4(PO4)2O. Journal of Solid State Chemistry, 25, 49–57.CrossRefGoogle Scholar
Brunel-Laugt, M., Durif, A. and Guitel, J. (1978) Structure cristalline de Cu4(PO4)2O. Journal of Solid State Chemistry, 25, 39–47.CrossRefGoogle Scholar
Finger, L.W. (1985) Fingerite, Cu11O2(VO4)6, a new vanadium sublimate from Izalco volcano E. Salvador: crystal structure. American Mineralogist, 70, 197–199.Google Scholar
Krivovichev, S.V. (2009) Structural Crystallography of Inorganic Oxysalts. Oxford University Press, New York.CrossRefGoogle Scholar
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Y. (2013a) Ericlaxmanite, IMA 2013-022. CNMNC Newsletter No. 16, August 2013, page 2706; Mineralogical Magazine, 77, 2695–2709.Google Scholar
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Y. (2013b) Kozyrevskite, IMA 2013-023. CNMNC Newsletter No. 16, August 2013, page 2706; Mineralogical Magazine, 77, 2695–2709.Google Scholar
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Lykova, I.S., Vigasina, M.F., Sidorov, E.G. and Pushcharovsky, D.Y. (2014) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. I. Yurmarinite, Na7(Fe3+,Mg,Cu)4(AsO4)6. Mineralogical Magazine, 78, 904–917.Google Scholar
Schwunck, H.-M., Moser, P. and Jung, W. (1998) Das Kupfer(II)-oxidphosphat Cu4O(PO4)2 in einer neuen, orthorombischen Modifikation durch Oxidation einer Tl/Cu/P-Legierung. Zeitschrift für anorganische und allgemeine Chemie, 624, 1262–1266.Google Scholar
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112–122.CrossRefGoogle Scholar
Staack, M. and Müller-Buschbaum, H. (1996) Zur Kenntnis des Kupfer-Oxid-Arsenats Cu4O(AsO4)2. Zeitschrift für Naturforschung, Teil B. Anorganische Chemie, Organische Chemie, 51b, 1279–1282.Google Scholar