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Antipinite, KNa3Cu2(C2O4)4, a new mineral species from a guano deposit at Pabellón de Pica, Chile

Published online by Cambridge University Press:  02 January 2018

Nikita V. Chukanov*
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
Sergey M. Aksenov
Faculty of Geology, St Petersburg State University, University Embankment 7/9, St Petersburg, 199034 Russia Institute of Crystallography, Russian Academy of Sciences, 59 Lenin Avenue, Moscow, 117333 Russia
Ramiza K. Rastsvetaeva
Institute of Crystallography, Russian Academy of Sciences, 59 Lenin Avenue, Moscow, 117333 Russia
Konstantin A. Lyssenko
Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Street 28, Moscow, 119991 Russia
Dmitriy I. Belakovskiy
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 8-2, Moscow, 117071 Russia
Gunnar Färber
Bornsche Strasse 9, 39326 Samswegen, Germany
Gerhard Möhn
Dr J. Wittemannstrasse 5, 65527 Niedernhausen, Germany
Konstantin V. Van
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432 Russia


The new oxalate mineral antipinite is found in a guano deposit located on the Pabellón de Pica Mountain, Iquique Province, Tarapacá Region, Chile. Associated minerals are halite, salammoniac, chanabayaite, joanneumite and clays. Antipinite occurs as blue, imperfect, short prismatic crystals up to 0.1 mm × 0.1 mm × 0.15 mm in size, as well as their clusters and random aggregates. The mineral is brittle. Mohs hardness is 2; Dmeas = 2.53(3), Dcalc = 2.549 g cm–3. The infrared spectrum shows the presence of oxalate anions and the absence of absorptions associated with H2O molecules, C–H bonds, CO32–, NO3 and OH ions. Antipinite is optically biaxial (+), α = 1.432(3), β = 1.530(1), γ = 1.698(5), 2Vmeas = 75(10)°, 2Vcalc = 82°. The chemical composition (electron-microprobe data, C measured by gas chromatography of products of ignition at 1200°C, wt.%) is Na2O 15.95, K2O 5.65, CuO 27.34, C2O3 48.64, total 99.58. The empirical formula is K0.96Na3.04Cu2.03(C2.00O4)4 and the idealized formula is KNa3Cu2(C2O4)4. The crystal structure was solved and refined to R = 0.033 based upon 4085 unique reflections with I > 2σ(I). Antipinite is triclinic, space group P1, a = 7.1574(5), b = 10.7099(8), c = 11.1320(8) Å, α = 113.093(1), β = 101.294(1), γ = 90.335 (1)°, V = 766.51(3) Å3, Z = 2. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (hkl)] are 5.22 (40) (111), 3.47 (100) (032), 3.39 (80) (210), 3.01 (30) (033, 220), 2.543 (40) (122, 034, 104), 2.481 (30) (213), 2.315 (30) (143, 310), 1.629 (30) (146, 414, 243, 160).

Research Article
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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Appleton, ID. and Notholt, A.J.G. (2002) Local phosphate resources for sustainable development of Central and South America. British Geological Survey Economic Minerals and Geochemical Baseline Programme Report, CR/02/122/N. BGS, Keyworth, Nottingham, UK.Google Scholar
Bojar, H.-P. and Walter, F. (2012) Joanneumite, IMA 2012-001. CNMNC Newsletter No. 13, June 2012, 814. Mineralogical Magazine, 76, 807817.Google Scholar
Bojar, H.-P., Walter, E, Baumgartner, J. and Farber, G. (2010) Ammineite, CuCl2(NH3)2, a new species containing an ammine complex: mineral data and crystal structure. The Canadian Mineralogist, 48, 13591371.CrossRefGoogle Scholar
Bouayad, A., Trombe, J.C. and Gleizes, A. (1995) Barium-copper(II) oxocarbon compounds: synthesis, crystal structures and thermal behaviours of [Ba (H2O)5][Cu(C2O4)2(H2O)] and [Ba(C404)o.5(H20)2]2[Cu(C4O4)2(H2O)2]. Inorganica Chimica Ada, 230, 17.CrossRefGoogle Scholar
Brandenburg, K. and Putz, H. (2005) DIAMOND Version 3. Crystal Impact GbR, Bonn, Germany.Google Scholar
Bruker (2009) APEX2. Bruker AXS Inc., Madison, Wisconsin, USA.Google Scholar
Burns, PC. and Hawthorne, F.C. (1995) Coordination-geometry structural pathways in Cu2+ oxysalt minerals. The Canadian Mineralogist, 33, 889905.Google Scholar
Burns, PC. and Hawthorne, F.C. (1996) Static and dynamic Jahn-Teller effects in Cu + oxysalt minerals. The Canadian Mineralogist, 34, 10891105.Google Scholar
Chananont, P., Nixon, P.E., Waters, J.M. and Waters, T.N. (1980) The structure of disodium catena-bis(\i-oxalato)-cuprate dehydrate. Ada Crystallographica, B36, 21452147.Google Scholar
Chisholm, IE., Jones, G.C. and Purvis, O.W. (1987) Hydrated copper oxalate, moolooite, in lichens. Mineralogical Magazine, 51, 715718.CrossRefGoogle Scholar
Chukanov, N.V, Zubkova, N.V, Mohn, G., Pekov, I.V, Zadov, A.E and Pushcharovsky, D.Y (2013) Chanabayaite, IMA 2013-065. CNMNC Newsletter No. 17, October, 2013, p. 3004. Mineralogical Magazine, 11, 29973005.Google Scholar
Chukanov, N.Y, Aksenov, S.M., Rastsvetaeva, R.K., Lysenko, K.A., Belakovskiy, D.I., Farber, G. and Van, K.Y (2014a) Antipinite, IMA 2014-027. CNMNC Newsletter No. 21, August 2014, page 837; Mineralogical Magazine, 78, 833840.Google Scholar
Chukanov, N.Y, Britvin, S.N., Mohn, G., Pekov, I.Y, Zubkova, N.Y, Nestola, E, Kasatkin, A.Y and Dim, M. (20146) Shilovite, IMA 2014-016. CNMNC Newsletter No. 21, October 2014, page 798. Mineralogical Magazine, 78, 797804.Google Scholar
Clarke, R.M. and Williams, I.R. (1986) Moolooite, a naturally occurring hydrated copper oxalate from Western Australia. Mineralogical Magazine, 50, 295298.CrossRefGoogle Scholar
Ericksen, G.E. (1981) Geology and origin of the Chilean nitrate deposits. United States Geological Survey Professional Paper, 1188. USGS, Washington DC.CrossRefGoogle Scholar
Frost, R.L. (2004) Raman spectroscopy of natural oxalates. Analytica Chimica Ada, 517, 207214.CrossRefGoogle Scholar
Frost, R.L., Yang Jing and Zhe Ding (2003) Raman and FTIR spectroscopy of natural oxalates: implications for the evidence of life on Mars. Chinese Science Bulletin, 48, 18441852.CrossRefGoogle Scholar
Gleizes, A., Maury, F. and Galy, I (1980) Crystal structure and magnetism of sodium te(oxalato)cuprate(II) dihydrate, Na2Cu(C2O4)2-2H2O. A deductive proposal of the structure of copper oxalate, Cu(C2O4) xH2O (0 < x < 1). Inorganic Chemistry, 19, 20742078.CrossRefGoogle Scholar
Hallock, R.B., Rhine, WE., Cima, M.I, Bott, S.G. and Atwood, IL. (1990) Synthesis and X-ray crystal structure of BaCu(C2O4)2-6H2O, a mixed-metal oxalate of barium and copper. Superconductivity and Ceramic Superconductors II (Ceramic Transactions), 13, 251258.Google Scholar
Insausti, M., Urtiaga, M.K., Cortes, R., Mesa, IL. and Arriortua, M.I. (1994) Synthesis, crystal structure and properties of Sr2Cu(C2O4)3(H2O)7: precursor of Sr2Cu03 oxide. Journal of Materials Chemistry, 4, 1867–870.CrossRefGoogle Scholar
Jian, F, Wei-Yin, S., Okamura, T., Kai-Bei, Y andUeyama, N. (2001) The X-ray crystal structural characterization of dipotassium bisoxalato copper(II) tetrahydrate, [K2Cu(ox)2-4H2O] (ox = oxalate dianion). Inorganica Chimica Ada, 319, 240246.Google Scholar
Kasthuri, YB., Rao, P.M. and Nethaji, M. (1996) The crystal structure of hydrated barium copper oxalate. Crystal Research and Technology, 31, 287294.CrossRefGoogle Scholar
Kolitsch, U. (2004) RbCr(III)(C2O4)2-2H2O, Cs2Mg (C2O4)2-4H2O and Rb2Cu(II)(C2O4)2-2H2O: three new complex oxalate hydrates. Ada Crystallographica, C60, 129133.Google Scholar
Krivovivhev, S.Y, Filatov, S.K. and Vergasova, L.P. (2013) The crystal structure of ilinskite, NaCu5O2(SeO3)2Cl3, and review of mixed-ligand CuOmCln coordination geometries in minerals and inorganic compounds. Mineralogy and Petrology, 107, 235242.CrossRefGoogle Scholar
Nyquist, R.A., Putzig, C.L. and Leugers, M.A. (1996) Handbook of Infrared and Raman Spectra of Inorganic Compounds and Organic Salts. Vol. 3, Academic Press, New York.Google Scholar
Palatinus, L. and Chapuis, G. (2007) SUPERFLIP-a computer program for the solution of crystal structures by charge flipping in arbitrary dimensions. Journal of Appied Crystallography, 40, 786790.CrossRefGoogle Scholar
Pankhurst, R.I and Herve, F (2007) Introduction and overview. Pp. 14 in: The Geology of Chile (T Moreno and W Gibbons, editors). The Geological Society, London.Google Scholar
Pannhorst, W and Lohn, I (1974) Die Kristallstruktur von Caesium-Kupfer(II)—Oxalat—Dihydrat, Cs2Cu (C2O4)2-2H2O. Zeitschrift fur Kristallographie, 139, 236245.CrossRefGoogle Scholar
Petricek, Y, Dusek, M. and Palatinus, L. (2006) Jana2006. Structure Determination Software Programs. Institute of Physics, Praha, Czech Republic.Google Scholar
Rouse, R.C., Peacor, D.R., Dunn, P.I, Simmons, WB. and Newbury, D. (1986) Wheatleyite, Na2Cu (C2O4)2'2H2O, a natural sodium copper salt of oxalic acid. American Mineralogist, 71, 12401242.Google Scholar
Schmittler, H. (1968) Structural principle of disordered copper(II) oxalate CuC2O4-«H2O. Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin, 10, 581604.Google Scholar
Wu, W.-Y and Zhai, L. (2007) Poly[diaqua-|i-oxalato-copper(II) monohydrate]. Ada Crystallographica. E63, m567-m568.Google Scholar
Yesilel, O.Z., Erer, H., Odabasoglu, M. and Buyukgungor, O. (2010) A novel copper(II)-hydrogen oxalate coordination polymer showing a new coordinate mode. Journal of Inorganic and Organometallic Polymers, 20, 7882.CrossRefGoogle Scholar
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Antipinite, KNa3Cu2(C2O4)4, a new mineral species from a guano deposit at Pabellón de Pica, Chile
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