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Kingsgateite, ZrMo6+2O7(OH)2⋅2H2O, the first natural zirconium molybdate from Kingsgate, New South Wales, Australia
Published online by Cambridge University Press: 27 April 2022
Abstract
Kingsgateite, ZrMo6+2O7(OH)2⋅2H2O, is a new supergene mineral from the Old 25 Pipe, Kingsgate, Gough Co., New South Wales, Australia. The mineral occurs in cavities in a quartz, muscovite matrix associated with molybdenite, gelosaite and mambertiite. It forms yellowish green to bluish grey, square tabular crystals to 0.12 mm across. Kingsgateite has a white streak and a vitreous lustre. Cleavage was not observed and the fracture is uneven. The calculated density is 3.74 g/cm–3 based on the empirical formula. Kingsgateite is optically biaxial (+), the calculated indices of refraction are α = 1.88, β = 1.89, γ = 1.96 and 2Vcalc = 42.6°. The pleochroism is X = light orange, Y = light yellow and Z = red brown; Y < X < Z. The mineral is tetragonal, space group I41cd, a = 11.4626(16), c = 12.584(3) Å, V = 1653.4(6) Å3 and Z = 8. Electron microprobe analysis yielded ZrO2 23.09, UO2 1.14, ThO2 0.76, FeO 0.62, MoO3 59.27, P2O5 0.29, SO3 1.25, Cl 0.16, H2O 11.62, O=Cl –0.04, total 98.16 wt.%. The empirical formula on the basis of 11 anions per formula unit is Zr0.88U6+0.02Th0.01Fe2+0.04Mo6+1.94S0.07P0.02O6.90Cl0.02OH2.08⋅2.00H2O. The crystal structure of kingsgateite, refined using synchrotron single-crystal data [R1 = 4.53% for 1159 reflections with Fo > 4σ(Fo)], is a framework of edge- and corner-sharing ZrO5(OH)2 pentagonal bipyramids and MoO4(OH)(H2O) octahedra. Kingsgateite is isostructural with the synthetic compound ZrMo6+2O7(OH)2⋅2H2O.
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- Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland
Footnotes
Associate Editor: Peter Leverett
References
Aragao, D., Aishima, J., Cherukuvada, H., Clarken, R., Clift, M., Cowieson, N.P., Ericsson, D.J., Gee, C.L., Macedo, S., Mudie, N., Panjikar, S., Price, J.R., Riboldi-Tunnicliffe, A., Rostan, R., Williamson, R. and Caradoc-Davies, T.T. (2018) MX2: a high-flux undulator microfocus beamline serving both the chemical and macromolecular crystallography communities at the Australian Synchrotron. Journal of Synchrotron Radiation, 25, 885–891.CrossRefGoogle ScholarPubMed
Cao, Y.L., Deng, X.B., Ma, H., Wang, S.F. and Zhao, X.H. (2006) The synthesis and characterization of ZrW2O7(OH1–x,Clx)2⋅2H20 (x = 0.016, 0.025). Defect and Diffusion Forum, 251–252, 21–26.Google Scholar
Clearfield, A. and Blessing, R.H. (1972) The preparation and crystal structure of a basic zirconium molybdate and its relationship to ion exchange gels. Journal of Inorganic and Nuclear Chemistry, 34, 2643–2663.CrossRefGoogle Scholar
Clearfield, A. and Blessing, R.H. (1974) The preparation of a crystalline basic zirconium tungstate. Journal of Inorganic and Nuclear Chemistry, 36, 1174–1176.CrossRefGoogle Scholar
Clissold, M.E., Leverett, P., Sharpe, J.L. and Williams, P.A. (2008) Primary bismuth minerals from the Wolfram pipe, Kingsgate, New South Wales. Australian Journal of Mineralogy, 14, 19–28.Google Scholar
Dadachov, M.S. and Lambrecht, R.M. (1997) Synthesis and crystal structure of zirconium tungstate ZrW2O7(OH,Cl)2⋅2H2O. Journal of Materials Chemistry, 7, 1867–1870.CrossRefGoogle Scholar
Elliott, P. and Kampf, A.R. (2019) Kingsgateite, IMA 2019-048. CNMNC Newsletter No. 51. Mineralogical Magazine, 83, 757–761, doi: 10.1180/mgm.2019.58Google Scholar
England, B.M. (1985) The Kingsgate mines, New South Wales, Australia. The Mineralogical Record, 16, 265–289.Google Scholar
Farrugia, L.J. (2012) WinGX and ORTEP for Windows: an update. Journal of Applied Crystallography, 45, 849–854.CrossRefGoogle Scholar
Gagné, O.C. and Hawthorne, F.C. (2015) Comprehensive derivation of bond-valence parameters for ion pairs involving oxygen. Acta Crystallographica, B71, 562–578.Google Scholar
Lawrence, L.J. and Markham, N.L. (1962) A contribution to the study of the molybdenite pipes of Kingsgate, NSW, with special reference to ore mineralogy. Proceedings of the Australasian Institute of Mining and Metallurgy, 203, 67–94.Google Scholar
Pouchou, J.L. and Pichoir, F. (1985) “PAP” σρZ) procedure for improved quantitative microanalysis. Pp. 104–106 in: Microbeam Analysis (Armstrong, J.T., editor). San Francisco Press, California, USA.Google Scholar
Sarkar, D., Mohapatra, D., Ray, S., Bhattacharyya, S., Adak, S. and Mitra, N. (2007) Synthesis and Characterization of Sol–Gel derived ZrO2 doped Al2O3 nanopowder. Ceramics International, 33, 1275–1282.CrossRefGoogle Scholar
Sharpe, J.L. and Williams, P.A. (2004) Secondary bismuth and molybdenum minerals from Kingsgate, New England district of New South Wales. Australian Journal of Mineralogy, 10, 7–12.Google Scholar
Sheldrick, G.M. (2015a) SHELXT - Integrated space-group and crystal-structure determination. Acta Crystallographica, A71, 3–8.Google Scholar
Sheldrick, G.M. (2015b) Crystal structure refinement with SHELX. Acta Crystallographica, C71, 3–8.Google Scholar
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