Is the mineral borickyite (Ca,Mg)(Fe3+,Al)4(PO4,SO4,CO3)(OH)8•3-7.5H2O the same as delvauxite CaFe3+4(PO4,SO4)2(OH)8•4-6H2O?
| Data(s) |
15/06/2012
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| Resumo |
The two minerals borickyite and delvauxite CaFe3+4(PO4,SO4)2(OH)8•4-6H2O have the same formula. Are the minerals identical or different? The minerals borickyite and delvauxite have been characterised by Raman spectroscopy. The minerals are related to the minerals diadochite and destinezite. Both minerals are amorphous. Delvauxite appears to vary in crystallinity from amorphous to semi-crystalline. The minerals are often X-ray non-diffracting. The minerals are found in soils and may be described as ‘colloidal’ minerals. Vibrational spectroscopy enables an assessment of the molecular structure of borickyite and delvauxite. Bands are assigned to phosphate and sulphate stretching and bending modes. Multiple water bending and stretching modes imply that non-equivalent water molecules in the structure exist with different hydrogen bond strengths. The two minerals show differing spectra and must be considered as different minerals. |
| Formato |
application/pdf |
| Identificador | |
| Publicador |
Elsevier B.V. |
| Relação |
http://eprints.qut.edu.au/49525/1/49525_acceptedVer.pdf DOI:10.1016/j.saa.2012.02.102 Frost, Ray L., Palmer, Sara J., & Xi, Yunfei (2012) Is the mineral borickyite (Ca,Mg)(Fe3+,Al)4(PO4,SO4,CO3)(OH)8•3-7.5H2O the same as delvauxite CaFe3+4(PO4,SO4)2(OH)8•4-6H2O? Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy, 92, pp. 377-381. |
| Direitos |
Copyright 2012 Elsevier B.V. NOTICE: this is the author’s version of a work that was accepted for publication in Spectrochimica Acta Part A Molecular and Biomolecular 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 Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Vol: 92, Issue: June, 2012 DOI: 10.1016/j.saa.2012.02.102 Reference: http://www.elsevier.com/wps/find/authorsview.authors/postingpolicy#Scholarly |
| Fonte |
School of Chemistry, Physics & Mechanical Engineering; Science & Engineering Faculty |
| Palavras-Chave | #030606 Structural Chemistry and Spectroscopy #Raman spectroscopy, borickyite, phosphate, sulphate, delvauxite |
| Tipo |
Journal Article |
