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Structural interpretation of anion exchange in divalent copper hydroxysalt minerals

Published online by Cambridge University Press:  09 July 2018

TS. Stanimirova ,
S. Dencheva  and
G. Kirov
TS. Stanimirova*
Affiliation:
University of Sofia “St. Kliment Ohridski”, Faculty of Geology and Geography, Department of Mineralogy, Petrology and Economic Geology, 1000 Sofia, 15 Tzar Osvoboditel Blvd, Bulgaria
S. Dencheva
Affiliation:
University of Sofia “St. Kliment Ohridski”, Faculty of Geology and Geography, Department of Mineralogy, Petrology and Economic Geology, 1000 Sofia, 15 Tzar Osvoboditel Blvd, Bulgaria
G. Kirov
Affiliation:
University of Sofia “St. Kliment Ohridski”, Faculty of Geology and Geography, Department of Mineralogy, Petrology and Economic Geology, 1000 Sofia, 15 Tzar Osvoboditel Blvd, Bulgaria
*
*E-mail: stanimirova@gea.uni-sofia.bg
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Abstract

Minerals with the general formula Cu4(OH)6A2/nn ± pH2O (A = Cl–, NO3–, SO42–) were synthesized and their behaviour following treatment with chloride, nitrate and sulfate solutions was studied by powder XRD and SEM. Two types of transformation were found: (1) an ion-exchange reaction manifested by preservation of both the precursor's morphology and structural type; (2) a dissolution-crystallization mechanism characterized by changes in the structural type and the morphology.

The results were considered by simultaneous application of the binary presentation of the structures, a bond valence approach and the ion-exchange ability. It was found that the structures of minerals with ion-exchange properties are built from similar layered structural unit of edge-shared and corner-shared Jahn-Teller square frameworks and different interstitial complexes of exchangeable ions, water molecules and cation-water groups. On the basis of their structural features the position of the investigated minerals in mineralogical classifications is also discussed.

Keywords

copper hydroxysalt mineralsbinary presentationJahn-Teller effection-exchangepowder XRD
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 1 , March 2013 , pp. 21 - 36
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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