Titre du document / Document title

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

Auteur(s) / Author(s)

SONG Y. ⁽¹⁾ ; MOON H.-S. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Department of Geology, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, COREE, REPUBLIQUE DE

Résumé / 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 pecoraite-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 SO₄^2- for CO₃^2- 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.

Revue / Journal Title

Clay minerals   ISSN 0009-8558   CODEN CLMIAF 

Source / Source

1998, vol. 33, n^o2, pp. 285-296 (20 ref.)

Langue / Language

Anglais

Editeur / Publisher

Mineralogical Society, London, ROYAUME-UNI  (1965) (Revue)

Mots-clés anglais / English Keywords

new minerals ; reevesite ; hydrotalcite ; secondary minerals ; serpentinization ; ultramafics ; Korea ; paragenesis ; veins ; fractures ; chemical analysis ; solid solution ; structural formula ; ferric iron ; cobalt ; crystal chemistry ; substitution ; sulfate ion ; carbonate ion ; X-ray diffraction ; X-ray powder diffraction ; infrared spectroscopy ; Fourier transformation ; electron probe data ; carbonates ; plutonic rocks ; igneous rocks ; Far East ; Asia ;

Mots-clés français / French Keywords

Minéral nouveau ; Reevesite ; Hydrotalcite ; Minéral secondaire ; Serpentinisation ; Roche ultramafique ; Corée ; Paragenèse ; Filon ; Fracture ; Analyse chimique ; Solution solide ; Formule structurale ; Fer ferrique ; Cobalt ; Cristallochimie ; Substitution ; Ion sulfate ; Ion carbonate ; Diffraction RX ; Diagramme poudre ; Spectrométrie IR ; Transformation Fourier ; Donnée microsonde électronique ; Carbonate ; Roche plutonique ; Roche ignée ; Extrême Orient ; Asie ;

Mots-clés espagnols / Spanish Keywords

Mineral nuevo ; Reevesita ; Mineral secundario ; Serpentinización ; Corea ; Paragénesis ; Filón ; Fractura ; Análisis químico ; Solución sólida ; Hierro férrico ; Cobalto ; Cristaloquímica ; Substitución ; Ión sulfato ; Ión carbónato ; Difracción RX ; Diagrama polvo ; Espectrometría IR ; Dato sonda electrónica ; Carbonato ; Roca granuda ; Roca ignea ; Extremo Oriente ; Asia ;

Localisation / Location

INIST-CNRS, Cote INIST : 2996, 35400007631410.0110