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The crystal chemistry of the humite minerals; Fe (super 2+) -Ti (super 4+) charge transfer and structural allocation of Ti (super 4+) in chondrodite and clinohumite

Klaus Langer, Alexej N. Platonov, Stanislav S. Matsyuk and Manfred Wildner
The crystal chemistry of the humite minerals; Fe (super 2+) -Ti (super 4+) charge transfer and structural allocation of Ti (super 4+) in chondrodite and clinohumite (in 4th European conference on Mineralogy and spectroscopy, Georges Calas (president))
European Journal of Mineralogy (December 2002) 14 (6): 1027-1032

Abstract

An XRD, EPMA and polarized electron absorption spectroscopy study is reported of two chondrodites and four clinohumites. The dominating features of all spectra are: 1) a slightly polarized absorption edge in the UV at energies > 35 000 cm (super -1) , 2) a strong, broad band at 23 300 cm (super -1) with band widths near 6000 cm (super -1) and strong polarization with E alpha and 3) a complex low energy band system at 11 600 cm (super -1) in E alpha , 9500 in E gamma and 7700 cm (super -1) in E beta (corresponding with the d-d bands in olivines caused by Fe (super 2+) in M1 and M2). These spectral properties explain colour and pleochroism (alpha golden yellow to orange, beta and gamma light yellow to almost colourless). The band energy is consistent with that expected for metal-metal charge transfer in Fe (super 2+) Ti (super 4+) pairs. The Ti (super 4+) is allocated to the M3 position.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 14
Serial Issue: 6
Title: The crystal chemistry of the humite minerals; Fe (super 2+) -Ti (super 4+) charge transfer and structural allocation of Ti (super 4+) in chondrodite and clinohumite
Title: 4th European conference on Mineralogy and spectroscopy
Author(s): Langer, KlausPlatonov, Alexej N.Matsyuk, Stanislav S.Wildner, Manfred
Author(s): Calas, Georgespresident
Affiliation: Technische Universitat, Institut fur Angewandte Geowissenschaften, Berlin, Federal Republic of Germany
Affiliation: CNRS, Laboratoire de Mineralogie-Cristallographie de Paris, Paris, France
Pages: 1027-1032
Published: 200212
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: 4th European conference on Mineralogy and spectroscopy (ECMS4)
Meeting location: Paris, FRA, France
Meeting date: 20010910Sept. 10-14, 2001
References: 25
Accession Number: 2003-006870
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Ukrainian Academy of Science, UKR, UkraineUniversitat Wien, AUT, Austria
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200302
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