Is chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O related to spertiniite Cu(OH)2? - a vibrational spectroscopic study
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2013
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Resumo |
Chrysocolla (Cu, Al)2H2Si2O5(OH)4·nH2O is a hydrated copper hydroxy silicate and is commonly known as a semi-precious jewel. The mineral has an ill defined structure but is said to be orthorhombic, although this remains unproven. Thus, one of the few methods of studying the molecular structure of chrysocolla is to use vibrational spectroscopy. Chrysocolla may be defined as a colloidal mineral. The question arises as to whether chrysocolla is a colloidal system of spertiniite and amorphous silica. The main question addressed by this study is whether chrysocolla is (1) a mesoscopic assemblage of spertiniite, Cu(OH)2, silica, and water, (2) represents a colloidal gel or (3) is composed of microcrystals with a distinct structure. Considerable variation in the vibrational spectra is observed between chrysocolla samples. The Raman spectrum of chrysocolla is characterised by an intense band at 3624 cm−1 assigned to the OH stretching vibrations. Intense Raman bands found at 674, 931 and 1058 cm−1 are assigned to SiO3 vibrations. The Raman spectrum of spertiniite does not correspond to the spectrum of chrysocolla and it is concluded that the two minerals are not related. The spectra of chrysocolla correspond to a copper silicate colloidal gel. |
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Identificador | |
Publicador |
Elsevier |
Relação |
http://eprints.qut.edu.au/58692/11/58692.pdf http://eprints.qut.edu.au/58692/12/58692a.pdf http://eprints.qut.edu.au/58692/15/58692b.pdf http://eprints.qut.edu.au/58692/16/58692c.pdf http://eprints.qut.edu.au/58692/17/58692d.pdf http://eprints.qut.edu.au/58692/18/58692e.pdf http://eprints.qut.edu.au/58692/19/58692f.pdf http://eprints.qut.edu.au/58692/20/58692g.pdf DOI:10.1016/j.vibspec.2012.10.001 Frost, Ray L. & Xi, Yunfei (2013) Is chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O related to spertiniite Cu(OH)2? - a vibrational spectroscopic study. Vibrational Spectroscopy, 64, pp. 33-38. |
Direitos |
Copyright 2012 Elsevier B.V. All rights reserved This is the author’s version of a work that was accepted for publication in Vibrational Spectroscopy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Vibrational Spectroscopy, [VOL 64, ISSUE -, (2013)] DOI: 10.1016/j.vibspec.2012.10.001 |
Fonte |
School of Chemistry, Physics & Mechanical Engineering; Science & Engineering Faculty |
Palavras-Chave | #030606 Structural Chemistry and Spectroscopy #Chrysocolla #Silicate #Spertiniite #Raman spectroscopy #Planchéite #Shattuckite |
Tipo |
Journal Article |