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GEOREF RECORD

Dickite and other kaolin polymorphs from an Al-rich clay deposit formed in volcanic tuff, southeastern Korea

Chang Oh Choo and Soo Jin Kim
Dickite and other kaolin polymorphs from an Al-rich clay deposit formed in volcanic tuff, southeastern Korea
Clays and Clay Minerals (December 2004) 52 (6): 749-759

Abstract

Kaolins from an Al-rich clay deposit formed in volcanic tuff, southeastern Korea, contain predominant dickite and quartz with accessory diaspore, pyrophyllite, alunite, illite, sulphides and calcite. Intergrowth of blocky crystals with thin ones within stacks suggests that blocky crystals gradually replaced thin ones within the same stacks. Numerous dickite plates with pseudo-hexagonal outline are placed in rows eventually forming a U-shaped stack and a vermiform stack. Individual crystals within the stack are of pseudo-hexagonal form and vermiform, accompanying slips across basal planes. The euhedral dickite with blocky habit has basal planes (001) and edge planes (110) perpendicular to each other, and it shows pseudo-hexagonal crystallites elongated in one direction. Fourier transform IR spectra at OH-stretching and far-IR regions show that the dickitic mass contains a small proportion of kaolinite or nacrite, indicating interstratification or at least mixtures of kaolin polytypes. The formation of mixtures of various polytypes that are of kaolinite-dickite, dickite and mixtures of dickite-nacrite could be attributed to hydrothermal processes ranging over a broad spectrum of T and fluid chemistry.


ISSN: 0009-8604
EISSN: 1552-8367
Serial Title: Clays and Clay Minerals
Serial Volume: 52
Serial Issue: 6
Title: Dickite and other kaolin polymorphs from an Al-rich clay deposit formed in volcanic tuff, southeastern Korea
Affiliation: Seoul National University, Department of Geological Sciences, Seoul, South Korea
Pages: 749-759
Published: 200412
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 42
Accession Number: 2005-010341
Categories: Economic geology, geology of nonmetal deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N35°00'00" - N35°00'00", E129°00'00" - E129°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200503
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