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Crystallization of hematite and goethite in the presence of soil minerals

Valter Boero and Marinella Franchini-Angela
Crystallization of hematite and goethite in the presence of soil minerals
European Journal of Mineralogy (June 1992) 4 (3): 539-546

Abstract

Freshly precipitated ferrihydrite, 5Fe (sub 2) O (sub 3) .9H (sub 2) O, was stored at pH 7 and 40 degrees C alone and in the presence of muscovite, kaolinite, quartz, gibbsite and soil clay at varying Mg mineral per mole Fe ratios (20, 200 and 500), and the crystallization of ferrihydrite into hematite and goethite was monitored after 20, 50, 100, 148 and 210 days. After 210 days the ferrihydrite suspension of soil minerals was nearly completely converted into a mixture of goethite and hematite. Muscovite seems to promote the transformation but deferrated soil clay > kaolinite > gibbsite > quartz retard the formation of the oxides. The best- developed morphologies of hematite plates, also with 120 degrees oriented goethite needles, were observed in the presence of muscovite, suggesting a strong template effect.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 3
Title: Crystallization of hematite and goethite in the presence of soil minerals
Affiliation: Universita di Torino, Istituto di Chimica Agraria, Turin, Italy
Pages: 539-546
Published: 199206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 25
Accession Number: 1995-056314
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 2 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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