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Spectroscopy of selected copper group minerals: ktenasite, orthoserpierite and kipushite

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Abstract

Near-infrared (NIR) and IR spectroscopy have been applied for the characterisation of three complex Cu–Zn sulphate/phosphate minerals, namely ktenasite, orthoserpierite and kipushite. The spectral signatures of the three minerals are quite distinct in relation to their composition and structure. The effect of structural cation substitution (Zn2+ and Cu2+) on band shifts is significant both in the electronic and in the vibrational spectra of these Cu–Zn minerals. The variable Cu:Zn ratio between Zn-rich and Cu-rich compositions shows a strong effect on Cu(II) bands in the electronic spectra. The Cu(II) spectrum is most significant in kipushite (Cu-rich) with bands displayed at high wavenumbers, 11,390 and 7,545 cm−1. The isomorphic substitution of Cu2+ for Zn2+ is reflected in the NIR and IR spectroscopic signatures. The multiple bands for ν3 and ν4 (SO4)2− stretching vibrations in ktenasite and orthoserpierite are attributed to the reduction in symmetry of the sulphate ion from Td to C2V. The IR spectrum of kipushite is characterised by strong (PO4)3− vibrational modes at 1,090 and 990 cm−1. The range of IR absorption is higher in ktenasite than in kipushite, while it is intermediate in orthoserpierite.

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Acknowledgments

The financial and infra-structure support of the Queensland University of Technology Inorganic Materials Research Program of the School of Physical and Chemical Sciences is gratefully acknowledged. The Queensland University of Technology is also acknowledged for the award of a Visiting Fellowship to B. Jagannnadha Reddy.

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Correspondence to Ray L. Frost.

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Frost, R.L., Jagannadha Reddy, B. & Keeffe, E.C. Spectroscopy of selected copper group minerals: ktenasite, orthoserpierite and kipushite. Transition Met Chem 35, 667–678 (2010). https://doi.org/10.1007/s11243-010-9378-6

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