This clay mineral was named by Yoshinaga Naganori and Aomine Shigenori (1962) after it was isolated and confirmed from a glassy volcanic ash soil called "imogo" in Kyushu. Chemically, it is a hydrate (SiO 2 ·Al 2 O 3 ·2.5H 2 O) in which silica and alumina are bonded in a fixed ratio of 1. The mineral unit has a hollow tubular structure with an outer diameter of about 20 Å and an inner diameter of about 10 Å, and appears fibrous under an electron microscope. To the naked eye, it is observed as a translucent gel-like film in the weathered pumice layer. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
吉永長則,青峰重範により命名(1962)された粘土鉱物で,九州の〈いもご〉と呼ばれるガラス質火山灰土壌から分離確認されたのでこの名がつけられた。化学的にはシリカとアルミナが分子比1の割合で一定の結合をした水和物(SiO2・Al2O3・2.5H2O)である。単位鉱物は外径約20Å,内径約10Åの中空の管状構造をもち,電子顕微鏡下では繊維状にみえる。肉眼的には,軽石風化物層中に半透明ゲル状皮膜として観察される。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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