Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-05T02:05:54.377Z Has data issue: false hasContentIssue false
  • English
  • Français

Antofagastaite, Na2Ca(SO4)2·1.5H2O, a new mineral related to syngenite

Published online by Cambridge University Press:  12 April 2019

Igor V. Pekov ,
Vadim M. Kovrugin ,
Oleg I. Siidra ,
Nikita V. Chukanov ,
Dmitry I. Belakovskiy ,
Natalia N. Koshlyakova ,
Vasiliy O. Yapaskurt ,
Anna G. Turchkova  and
Gerhard Möhn
Igor V. Pekov*
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991Moscow, Russia
Vadim M. Kovrugin
Affiliation:
Department of Crystallography, St Petersburg State University, University Embankment 7/9, 199034St Petersburg, Russia Laboratoire de Réactivité et Chimie des Solides, UMR 7314 CNRS, Université de Picardie Jules Verne, 33 rue St Leu, 80039Amiens, France
Oleg I. Siidra
Affiliation:
Department of Crystallography, St Petersburg State University, University Embankment 7/9, 199034St Petersburg, Russia Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, 184200Apatity, Russia
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow region, Russia
Dmitry I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071Moscow, Russia
Natalia N. Koshlyakova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991Moscow, Russia
Vasiliy O. Yapaskurt
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991Moscow, Russia
Anna G. Turchkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991Moscow, Russia
Gerhard Möhn
Affiliation:
Dr.-J.-Wittemannstrasse 5, 65527Niedernhausen, Germany
*
*Author for correspondence: Igor V. Pekov, Email: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

The new mineral antofagastaite, ideally Na2Ca(SO4)2·1.5H2O, was found in the oxidation zone of sulfide–quartz veins at the abandoned Coronel Manuel Rodríguez mine, Mejillones, Antofagasta Province, Antofagasta Region, Chile. It is associated with sideronatrite, metasideronatrite, aubertite, gypsum, ferrinatrite, glauberite, amarillite and an unidentified Fe phosphate. Antofagastaite occurs as prismatic crystals up to 0.5 mm × 1 mm × 5 mm, elongated along [010], typically combined in open-work aggregates up to 1 cm across. Antofagastaite is transparent and colourless, with vitreous lustre. It is brittle; the Mohs’ hardness is ca 3. Cleavage is distinct on (001). Dmeas. is 2.42(1) and Dcalc. is 2.465 g cm−3. Antofagastaite is optically biaxial (–), α = 1.489(2), β = 1.508(2), γ = 1.510(2) and 2Vmeas. = 40(10)°. The IR spectrum is reported. Chemical composition (wt.%, electron microprobe, H2O determined by gas chromatography) is: Na2O 20.85, CaO 17.42, SO3 52.56, H2O 7.93, total 98.76. The empirical formula (based on 8 O atoms belonging to sulfate anions per formula unit with all H belonging to H2O molecules) is Na2.06Ca0.95S2.01O8·1.35H2O. Antofagastaite is monoclinic, P21/m, a = 6.4596(4), b = 6.8703(5), c = 9.4685(7) Å, β = 104.580(4)°, V = 406.67(5) Å3 and Z = 2. The strongest reflections of the powder XRD pattern [d, Å (I, %) (hkl)] are: 9.17 (100) (001), 5.501 (57) (011), 3.437 (59) (020), 3.058 (43) (003), 2.918 (50) (2¯11), 2.795 (35) (013) and 2.753 (50) (121, 201). The crystal structure was solved based on single-crystal X-ray diffraction data, R1 = 5.71%. The structure of antofagastaite consists of ordered and disordered blocks and is related to syngenite K2Ca(SO4)2·H2O. Incorporation of additional H2O molecules in the syngenite-type structure results in disorder of the one of the two tetrahedral sulfate groups occurring in antofagastaite. In addition to the above-reported type material, antofagastaite together with syngenite and blödite occurs in the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia.

Keywords

antofagastaitenew mineralhydrated sodium calcium sulfatesyngenitecrystal structureoxidation zone of ore depositCoronel Manuel Rodríguez mineAtacama DesertfumaroleTolbachik volcano
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 6 , December 2019 , pp. 781 - 790
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019

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.)

Footnotes

Associate Editor: František Laufek

References

Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C. (2003) Handbook of Mineralogy, Volume: V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, 813 pp.Google Scholar
Araki, T. and Zoltai, T. (1967) Refinement of the crystal structure of a glauberite. American Mineralogist, 52, 1272–1277.Google Scholar
Ballirano, P., Belardi, G. and Maras, A. (2005) Refinement of the structure of synthetic syngenite K2Ca(SO4)2·H2O from X-ray powder diffraction data. Neues Jahrbuch für Mineralogie - Abhandlungen, 182, 15–21.Google Scholar
Bokiy, G.B., Pal'chik, N.A. and Antipin, M.Y. (1978) More precise determination of syngenite crystal structure. Kristallografiya, 23, 257–260 [in Russian].Google Scholar
Britvin, S.N., Dolivo-Dobrovolsky, D.V. and Krzhizhanovskaya, M.G. (2017) Software for processing the X-ray powder diffraction data obtained from the curved image plate detector of Rigaku RAXIS Rapid II diffractometer. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 146, 104–107 [in Russian].Google Scholar
Chukanov, N.V. (2014) Infrared Spectra of Mineral Species: Extended Library. Springer Verlag, Dordrecht, 1716 pp.CrossRefGoogle Scholar
Corazza, Ε. and Sabelli, C. (1967) The crystal structure of syngenite, K2Ca(SO4)2·H2O. Zeitschrift für Kristallographie, 124, 398–408.CrossRefGoogle Scholar
Freyer, D., Reck, G., Bremer, M. and Voigt, W. (1999) Thermal behaviour and crystal structure of sodium-containing hemihydrates of calcium sulfate. Monatshefte für Chemie, 130, 1179–1193.Google Scholar
Gerakines, P.A., Schutte, W.A., Greenberg, J.M. and van Dishoeck, E.F. (1995) The infrared band strengths of H2O, CO and CO2 in laboratory simulations of astrophysical ice mixtures. Astronomy and Astrophysics, 296, 810–818.Google Scholar
Leverett, P. and Williams, P.A. (2007) Unusual post-mining sulfates from the Peelwood and Lloyd mines, New South Wales, and a comment on wattevilleite. Australian Journal of Mineralogy, 13, 41–46.Google Scholar
Libowitzky, E. (1999) Correlation of O–H stretching frequencies and O–H···O hydrogen bond lengths in minerals. Monatshefte für Chemie, 130, 1047–1059.Google Scholar
Mees, F., Hatert, F. and Rowe, R. (2008) Omongwaite, Na2Ca5(SO4)6·3H2O, a new mineral from recent salt lake deposits, Namibia. Mineralogical Magazine, 72, 1307–1318.CrossRefGoogle Scholar
Mills, S.J., Kampf, A.R., Dini, M. and Molina, A. (2012) Die weltbesten Destinezit-Kristalle und andere seltene Sulfate von Mejillones, Chile. Mineralien-Welt, 23, 73–81. (In German).Google Scholar
Palache, C. and Foshag, W.F. (1938) Antofagastite and bandylite, two new copper minerals from Chile. American Mineralogist, 23, 85–90.Google Scholar
Palache, C., Berman, H. and Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837–1892. Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.Google Scholar
Palatinus, L. and Chapuis, G. (2007) SUPERFLIP – a computer program for the solution of crystal structures by charge flipping in arbitrary dimension. Journal of Applied Crystallography, 40, 786–790.CrossRefGoogle Scholar
Pekov, I.V., Koshlyakova, N.N., Zubkova, N.V., Lykova, I.S., Britvin, S.N., Yapaskurt, V.O., Agakhanov, A.A., Shchipalkina, N.V., Turchkova, A.G. and Sidorov, E.G. (2018) Fumarolic arsenates – a special type of arsenic mineralization. European Journal of Mineralogy, 30, 305–322.CrossRefGoogle Scholar
Pekov, I.V., Lykova, I.S., Agakhanov, A.A., Belakovskiy, D.I., Vigasina, M.F., Britvin, S.N., Turchkova, A.G., Sidorov, E.G. and Scheidl, K.S. (2019) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XII. Zubkovaite, Ca3Cu3(AsO4)4. Mineralogical Magazine, 83, https://doi.org/10.1180/mgm.2019.33Google Scholar
Sabelli, C. and Trosti-Ferroni, R. (1985) A structural classification of sulfate minerals. Periodico di Mineralogia, 54, 1–46.Google Scholar
Sheldrick, G.M. (2015) Crystal structure refinement with SHELXL. Acta Crystallographica, C71, 3–8.Google Scholar
Slyusareva, M.N. (1969) Hydroglauberite, a new mineral of the hydrous sulfate group. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 98, 59–62 [in Russian].Google Scholar
Vergouwen, L. (1981) Eugsterite, a new salt mineral. American Mineralogist, 66, 632–636.Google Scholar
Supplementary material: File

Pekov et al. supplementary material

Pekov et al. supplementary material

Download Pekov et al. supplementary material(File)
File 295.2 KB