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Halloysite Formation by the Alteration of Trachytic Glass in Ulleung Island
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 Title & Authors
Halloysite Formation by the Alteration of Trachytic Glass in Ulleung Island
Jeong, Gi-Young;
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Hydrated halloysite was formed by the low temperature alteration of trachytic tuff in onion-like spherical or curly platy forms. The Si content was higher than that of ideal kaolin minerals, indicating the possible presence of amorphous materials. The high Fe content is responsible for the platy morphology of halloysite. The leached ions precipitated as halloysite filling the interparticle pores, while trachytic glass was replaced by Si-rich amorphous materials in an hemispherical form, which was further evolved into spherical halloysite. Halloysite is one of the major alteration products of the volcanic ash in Ulleung Island underwent intense trachytic volcanism.
Halloysite;amorphous;volcanic glass;trachytic tuff;Ulleung Island;
 Cited by
울릉도의 하부층 현무암질 집괴암 층내 염기성 암맥에서 산출되는 타킬라이트의 광물학적 특성과 화산학적 의미,배수경;추창오;장윤득;

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