Iron oxide properties versus strength of ferruginous crust and iron-glaebules in soils

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Authors:Shadfan, H.; Dixon, J. B.; Calhoun, F. G.
Author Affiliations:Primary:
Tex. A&M Univ., Dep. Soil and Crop. Sci., College Station, TX, United States
Volume Title:Soil Science
Source:Soil Science, 140(5), p.317-325. Publisher: Williams & Wilkins Company, Baltimore, MD, United States. ISSN: 0038-075X
Publication Date:1985
Note:In English. 27 refs.; illus. incl. 1 table
Summary:The content, mineralogy and crystallinity of iron oxides were correlated with the strength of iron-rich materials in different environmental soil conditions. A predominance of goethite, hematite, or both was observed in the hard materials and kaolinite in the soft material of the laterite. The mean crystallite dimension of goethite and hematite showed a positive linear relationship with the strength of the materials. The degree of Al substitution was higher in the softer materials. Large crystals of goethite were observed by SEM in the harder materials. A suitable crystallization environment allowed the formation of large crystals, especially of the goethite type and in large amounts, that link together to form a rigid network and thereby cause the hardening of iron-rich materials. (Author's abstract) [C.N.]
Subjects:Case studies; Clay mineralogy; Clay minerals; Composition; Goethite; Hematite; Iron oxides; Kaolinite; Mineral composition; Mineral data; Oxides; SEM data; Sheet silicates; Silicates; Soils; Asia; India; Indian Peninsula; Jasper County Texas; Montgomery County Texas; South America; Texas; United States; Venezuela; Cochin
Abstract Numbers:87M/0264
Record ID:1986017545
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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