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Cation distribution in natural Zn-spinels; franklinite

Sergio Lucchesi, Umberto Russo and Antonio Della Giusta
Cation distribution in natural Zn-spinels; franklinite
European Journal of Mineralogy (June 1999) 11 (3): 501-511


The intracrystalline cation distribution in nine franklinite samples from Franklin and Sterling, New Jersey, was determined by single-crystal X-ray structural refinement supported for two samples by Moessbauer spectroscopy. The principal substitutions are Al for Fe (super 3+) in the octahedral site and Mn (super 2+) for Zn in the tetrahedral site; small amounts of Mn (super 3+) were required by stoichiometry in all samples, consequently Fe (super 2+) was absent. A limited inversion with Fe (super 3+) in the tetrahedral site, balanced by Mn (super 2+) + Zn in the octahedral site, is suggested. To obtain consistent cation distributions in these spinels, it was necessary to adopt a (super [4]) Zn-O distance of 1.999 Aa, i.e. very different from the value of 1.960 Aa previously used in Zn-aluminates, confirming observations by other authors.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 3
Title: Cation distribution in natural Zn-spinels; franklinite
Affiliation: Universita di Roma "La Sapienza", Dipartimento di Scienze della Terra, Rome, Italy
Pages: 501-511
Published: 199906
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 43
Accession Number: 1999-046900
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: Universita di Padova, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199916
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