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Additional data on reevesite and its Co-analogue, as a new member of the hydrotalcite group

Published online by Cambridge University Press:  09 July 2018

Y. Song  and
H.-S. Moon
Y. Song
Affiliation:
Department of Geology, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea
H.-S. Moon
Affiliation:
Department of Geology, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea
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Abstract

Reevesite, the Ni-Fe member of the hydrotalcite group, occurs as a secondary mineral in the serpentinized ultramafic rocks of the Kwangcheon area in Korea, replacing the pecoraitc-magnetite-millerite-polydymite assemblages in small veins lining cracks and fracture zones. Chemical analyses for the reevesites indicate the presence of the Co-analogue of reevesite and the complete solid-solution between Fe3+ and Co3+. The Co-analogue of the reevesite shows the approximate ratio of 3:1 of divalent to trivalent cations, which is in distinct contrast to the comblainite with the ratio of 2:1 reported by Piret & Deliens (1980). The presence of the complete solid-solution phase between Fe3+ and Co3+ is confirmed by synthesis at room temperature. On the basis of the results, the Co-analogue of the reevesite should be named as a new member of the hydrotalcite group, and thereby be distinguished from the comblainite. The partial substitutions of SO2-4 for CO2-3 in the interlayer region might affect the slight increase of the basal spacing in the reevesite. The synthesis performed suggests that the reevesite could be precipitated under either an alkaline or a neutral environment, if carbonate activity is high enough.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 2 , June 1998 , pp. 285 - 296
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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