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Mineralogical Magazine; April 2005; v. 69; no. 2; p. 155-167; DOI: 10.1180/0026461056920243
© 2005 Mineralogical Society of Great Britain and Ireland
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Characterization of conichalcite by SEM, FTIR, Raman and electronic reflectance spectroscopy

B. J. Reddy, R. L. Frost* and W. N. Martens

Inorganic Materials Research Program, Queensland University of Technology, 2 George Street, Brisbane, GPO Box 2434, Queensland 4001, Australia

* E-mail: r.frost{at}qut.edu.au

The mineral conichalcite from the western part of Bagdad mine, Bagdad, Eureka District, Yavapai County, Arizona, USA has been characterized by electronic, near-infrared (NIR), Raman and infrared (IR) spectroscopy. Scanning electron microscopy (SEM) images show that the mineral consists of bundles of fibres. Calculations based on the results of the energy dispersive X-ray analyses on a stoichiometric basis show the substitution of arsenate by 12 wt.% of phosphate in the mineral. Raman and IR bands are assigned in terms of the fundamental modes of AsO43– and PO43– molecules and are related to the mineral structure. Near-IR reflectance spectroscopy shows the presence of adsorbed water and hydroxyl units in the mineral. The Cu(II) coordination polyhedron in conichalcite can have at best pseudo-tetragonal geometry. The crystal field and tetragonal field parameters of the Cu(II) complex were calculated and found to agree well with the values reported for known tetragonal distortion octahedral complexes.

KEYWORDS: conichalcite, adelite, austenite, duftite, SEM and EDX analyses, FTIR, Raman spectroscopy, electronic reflectance spectroscopy






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