Journal of the Clay Science Society of Japan (in Japanese)
Online ISSN : 2186-3563
Print ISSN : 0470-6455
ISSN-L : 0470-6455
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Volume 15, Issue 3-4
Displaying 1-3 of 3 articles from this issue
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  • A Few Recent Findings Related to the Genesis and Distribution of Imogolite
    Naganori YOSHINAGA
    1975 Volume 15 Issue 3-4 Pages 65-69
    Published: November 25, 1975
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.15.65
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • The Effect of Defibrillation on the Orientation of Forsterite Recrystallized from Chrysotile
    Takashi OTOUMA, Shigeo TAKE
    1975 Volume 15 Issue 3-4 Pages 70-77
    Published: November 25, 1975
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.15.70
    JOURNAL FREE ACCESS
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    A sample of defibrillated and well orientated chrysotile fiber was prepared for X-ray rotation photograph, by opening the bundle of fiber physicochemically with sodium oleate, and the effect of the defibrillation on the orientation of forsterite recrystallized from chrysotile was studied. The forsterite formed from the defibrillated fiber is unoriented, although the forsterite from the undefibrillated chrysotile shows strong orientation. For defibrillated chrysotile, the forsterite is formed slowly and appears mainly at the temperature between 800°C and 830°C, at which temperature a large exothermic peak exists at DTA for the defibrillated chrysotile.
    These phenomena are interpreted as the result of highly disordered atomic arrangment, which was caused by the rapid dehydration of the defibrillated chrysotile, and may have correlation with the existence of 14Å phase formed after dehydration.
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  • On Sericite Minerals Associated With Kuroko Deposits
    Shoji HIGASHI, Haruo SHIROZU
    1975 Volume 15 Issue 3-4 Pages 78-85
    Published: November 25, 1975
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.15.78
    JOURNAL FREE ACCESS
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    Three sericite minerals collected from the alteration zones of the Matsumine deposit of the Hanaoka mine, Akita Prefecture, are described using x-ray, chemical analysis, infrared absorption, DTA and TG data, and their properties are discussed in comparison with those of sericite minerals associated with other Kuroko deposits.
    DTA curves of a regularly interstratified mineral of sericite and montmorillonite and a 1 M sericite, both having a phengitic octahedral composition, show two endothermic peaks of dehydroxylation, but another regularly interstratified sericite/montmorillonite of which the octahedral composition being close to that of muscovite gives only one peak. The difference in octahedral composition of sericite minerals as well as of the present samples is indicated by the vibration frequencies of infrared bands at about 3620 cm-1 and 530 cm-1. The numbers of absorption bands (one or two) in the 800-830 cm-1 range seem to be related to the octahedral composition rather than to polytype. The d (060) values also vary with octahedral composition, but slight difference of the relations of d (060) versus octahedral composition between the regularly and the randomly interstratified minerals suggests that there may be a compositional gap between these two minerals.
    Close relationships between the mineralogical properties of sericite minerals and their modes of occurrence are recognized.
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