GROWTH SPIRALS ON ETCHED KAOLINITE CRYSTALS
スポンサーリンク
概要
- 論文の詳細を見る
Natural growth faces and cleavages of kaolinite crystals were characterized by electron microscopy using a gold decoration method. The cleaved surfaces of kaolinites treated with urea followed by wet-grinding showed slip steps but not growth spirals, whereas the surfaces of kaolinites etched with NH_4F showed growth spirals. Therefore, the surface microtopographs of kaolinites with different crystallinities from deposits and soils were compared before and after etching with NH_4F. Well-crystallized kaolinites from hydrothermal deposits exhibited growth spirals with wide spacings, irrespective of whether they were etched with NH_4F or not, and were characterized by spiral growth from solution phase of low supersaturation. Poorly-crystallized kaolinites from sedimentary deposits showed growth spirals on the surface etched with NH_4F but not on the original surface. The concentration of NH_4F solution suitable for removal of the surface layers of kaolinite crystals was 5 to 15%. The relationships between the crystallinity and the type of growth spirals observed before and after etching with NH_4F were similar for kaolinites from residual soils other than one transported soil and kaolinites from deposits. The differences in environmental conditions of their formation were discussed.
- 日本粘土学会の論文
著者
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Yonebayashi Koyo
Faculty of Agriculture, Kyoto Prefectural Unirersity
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Hattori Tomoo
Faculty of Agriculture, Kyoto Prefectural University
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Hattori Tomoo
Faculty Of Agriculture Kyoto Prefectural University
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Hattori Tomoo
Faculty Of Agriculture Kyoto Prefectural University.
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Yonebayashi Koyo
Faculty Of Agriculture Kyoto Prefectural University
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Yonebayashi Koyo
Faculty Of Agriculture Kyoto Prefectural University.
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