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Effects of micro-sized mixtures of kaolin minerals on properties of kaolinites

W. D. Keller and R. P. Haenni
Effects of micro-sized mixtures of kaolin minerals on properties of kaolinites
Clays and Clay Minerals (December 1978) 26 (6): 384-396


"Kaolinites" from classic, large deposits of kaolin are shown commonly in scanning electron micrographs to be mixtures, at least in part, in microdimensions, of kaolin-mineral polymorphs. Artificial mixtures of selected kaolin polymorphs simulating the natural mixtures, also micrographed, show crystallinities intermediate between the crystallinities of the end members in X-ray powder diffractograms. Thus, apparent crystallinity interpreted from diffractograms of a kaolin specimen may be a product of kaolin-mineral mixture in microdimensions as well as from ordering in the crystals. Evaluation of the crystallinity of a kaolin from powder diffraction may be suspect if independent means, such as SEM, are not used to assess the monomineralic character of that kaolin specimen. Analogous to the apparent crystallinity of a "kaolinite" being the product of a mixture, so may other widely ranging properties of "kaolinite" be products of kaolin-mineral mixtures in microdimensions. These properties include DTA, IR, chemical composition, free energies of formation, and industrial applications. Specifications for a monomineralic, nearly ideal kaolinite are considered-the Keokuk geode variety possesses desired crystallographic and chemical properties.

ISSN: 0009-8604
Serial Title: Clays and Clay Minerals
Serial Volume: 26
Serial Issue: 6
Title: Effects of micro-sized mixtures of kaolin minerals on properties of kaolinites
Affiliation: Univ. Mo. Columbia, Columbia, Mo., United States
Pages: 384-396
Published: 197812
Text Language: English
Summary Language: Russian
Summary Language: German
Summary Language: French
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 20
Accession Number: 1980-011299
Categories: Mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. plates, charts
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 1980
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