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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 ,
Sergey M. Aksenov ,
Ramiza K. Rastsvetaeva ,
Konstantin A. Lyssenko ,
Dmitriy I. Belakovskiy ,
Gunnar Färber ,
Gerhard Möhn  and
Konstantin V. Van
Nikita V. Chukanov*
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
Sergey M. Aksenov
Affiliation:
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
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, 59 Lenin Avenue, Moscow, 117333 Russia
Konstantin A. Lyssenko
Affiliation:
Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Street 28, Moscow, 119991 Russia
Dmitriy I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 8-2, Moscow, 117071 Russia
Gunnar Färber
Affiliation:
Bornsche Strasse 9, 39326 Samswegen, Germany
Gerhard Möhn
Affiliation:
Dr J. Wittemannstrasse 5, 65527 Niedernhausen, Germany
Konstantin V. Van
Affiliation:
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432 Russia
*
*E-mail: nikchukanov@yandex.ru
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Abstract

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).

Keywords

antipinitenew mineraloxalatecrystal structureguanoPabellón de PicaChile
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 5 , October 2015 , pp. 1111 - 1121
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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