Is chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O related to spertiniite Cu(OH)2? - a vibrational spectroscopic study

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.

[img]
Preview
Accepted Version (PDF 110kB)
[img]
Preview
Supplemental Material (PDF 450kB)
[img]
Preview
Figure 1 (PDF 158kB)
Supplemental Material.
[img]
Preview
Figure 2 (PDF 163kB)
Supplemental Material.
[img]
Preview
Figure 3 (PDF 157kB)
Supplemental Material.
[img]
Preview
Figure 4 (PDF 145kB)
Supplemental Material.
[img]
Preview
Figure 5 (PDF 168kB)
Supplemental Material.
[img]
Preview
Figure 6 (PDF 103kB)
Supplemental Material.

View at publisher

Abstract

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.

Impact and interest:

6 citations in Scopus
Search Google Scholar™
6 citations in Web of Science®

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

479 since deposited on 04 Apr 2013
89 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 58692
Item Type: Journal Article
Refereed: Yes
Keywords: Chrysocolla, Silicate, Spertiniite, Raman spectroscopy, Planchéite, Shattuckite
DOI: 10.1016/j.vibspec.2012.10.001
ISSN: 0924-2031
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Elsevier B.V. All rights reserved
Copyright Statement: 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
Deposited On: 04 Apr 2013 03:54
Last Modified: 24 Apr 2013 03:11

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page