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Title: Chrysolcolla Redefined as Spertiniite

Abstract

XAFS and {mu}-XAFS spectra were collected at the Cu K-edge for seven chrysocolla samples (Peru, USA, and Congo). The results suggest that the local structure around Cu is similar to that in Cu(OH){sub 2} (spertiniite). Cu-L{sub 3} 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){sub 2}H{sub 2}Si{sub 2}O{sub 5}(OH){sub 4} {center_dot} nH{sub 2}O, is in actually a mesoscopic assemblage composed dominantly of spertiniite (Cu(OH){sub 2}), water and amorphous silica (SiO{sub 2}).

Authors:
; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
896405
Report Number(s):
SLAC-PUB-12232
TRN: US200703%%451
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Contributed to 13th International Conference on X-ray Absorption Fine Structure (XAFS13), Stanford, California, 9-14 Jul 2006
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; FINE STRUCTURE; COPPER HYDROXIDES; SILICA; SPECTRA; X-RAY SPECTROSCOPY; MINERALS; Other,BIO

Citation Formats

Farges, Francois, /Museum Nat. Hist., Paris /Stanford U., Geo. Environ. Sci., Benzerara, Karim, /Paris U., VI-VII, LMCP, Brown, Jr, Gordon E, and /Stanford U., Geo. Environ.Sci. /SLAC, SSRL. Chrysolcolla Redefined as Spertiniite. United States: N. p., 2006. Web.
Farges, Francois, /Museum Nat. Hist., Paris /Stanford U., Geo. Environ. Sci., Benzerara, Karim, /Paris U., VI-VII, LMCP, Brown, Jr, Gordon E, & /Stanford U., Geo. Environ.Sci. /SLAC, SSRL. Chrysolcolla Redefined as Spertiniite. United States.
Farges, Francois, /Museum Nat. Hist., Paris /Stanford U., Geo. Environ. Sci., Benzerara, Karim, /Paris U., VI-VII, LMCP, Brown, Jr, Gordon E, and /Stanford U., Geo. Environ.Sci. /SLAC, SSRL. 2006. "Chrysolcolla Redefined as Spertiniite". United States. https://www.osti.gov/servlets/purl/896405.
@article{osti_896405,
title = {Chrysolcolla Redefined as Spertiniite},
author = {Farges, Francois and /Museum Nat. Hist., Paris /Stanford U., Geo. Environ. Sci. and Benzerara, Karim and /Paris U., VI-VII, LMCP and Brown, Jr, Gordon E and /Stanford U., Geo. Environ.Sci. /SLAC, SSRL},
abstractNote = {XAFS and {mu}-XAFS spectra were collected at the Cu K-edge for seven chrysocolla samples (Peru, USA, and Congo). The results suggest that the local structure around Cu is similar to that in Cu(OH){sub 2} (spertiniite). Cu-L{sub 3} 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){sub 2}H{sub 2}Si{sub 2}O{sub 5}(OH){sub 4} {center_dot} nH{sub 2}O, is in actually a mesoscopic assemblage composed dominantly of spertiniite (Cu(OH){sub 2}), water and amorphous silica (SiO{sub 2}).},
doi = {},
url = {https://www.osti.gov/biblio/896405}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 13 00:00:00 EST 2006},
month = {Wed Dec 13 00:00:00 EST 2006}
}

Conference:
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