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Title:
Chrysocolla Redefined as Spertiniite
Authors:
Farges, François; Benzerara, Karim; Brown, Gordon E.
Affiliation:
AA(USM 201 ``Minéralogie-Pétrologie'', Muséum National d'Histoire Naturelle, CNRS UMR 7160, Paris, France; Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115), AB(Laboratoire de Minéralogie-Cristallographie, CNRS UMR 7590 and IPG Paris, France), AC(Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115; Stanford Synchrotron Radiation Laboratory, SLAC, MS 69, 2575 Sand Hill Road, Menlo Park, CA 94025)
Publication:
X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP Conference Proceedings, Volume 882, pp. 223-225 (2007). (AIPC Homepage)
Publication Date:
02/2007
Origin:
AIP
PACS Keywords:
Instruments and techniques for geophysical research: Exploration geophysics, Mineral and crystal chemistry
Abstract Copyright:
(c) 2007: American Institute of Physics
DOI:
10.1063/1.2644481
Bibliographic Code:
2007AIPC..882..223F

Abstract

XAFS and μ-XAFS spectra were collected at the Cu K-edge for seven chrysocolla samples (Peru, USA, and Congo). The results suggest that that the local structure around Cu is similar to that in Cu(OH)2 (spertiniite). Cu-L3 STXM imaging and spectroscopy confirm that the chrysocolla samples examined here consist of mesoscopic Cu(II)-rich domains surrounded by Si-rich domains (in agreement with results from infra-red spectroscopy). Hence, we suggest that chrysocolla, which is generally considered to be orthorhombic with composition (Cu,Al)2H2Si2O5(OH)4.nH2O, is in actually a mesoscopic assemblage composed dominantly of spertiniite (Cu(OH)2), water and amorphous silica (SiO2).
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