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Optical anisotropy in the spinel group; a polishing effect

Eugen Libowitzky
Optical anisotropy in the spinel group; a polishing effect
European Journal of Mineralogy (April 1994) 6 (2): 187-194


Examination of > 100 polished sections of magnetite, chromite, franklinite and jacobsite from approx 50 localities used two final polishing procedures. Using a 0.1 mu m diamond suspension on 'microcloth' always led to weak optical anisotropy, except for 100 and 111 sections, whereas use of an alkaline silica solution on 'microcloth' gave sections which remained isotopic with the exception of five zoned magnetites. Electron channelling pattern images with SEM showed a strongly damaged surface for samples prepared with the diamond suspension and a perfect undisturbed surface for those prepared using an alkali silica solution. This convincingly indicates that the anomalous optical anisotropy effects in the spinel group are usually caused by mechanical polishing procedures.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 2
Title: Optical anisotropy in the spinel group; a polishing effect
Author(s): Libowitzky, Eugen
Affiliation: Universitaet Wien, Institut fuer Mineralogie und Kristallographie, Vienna, Austria
Pages: 187-194
Published: 199404
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 23
Accession Number: 1994-025767
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199412
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