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- D'Ippolito, VeronicaSapienza Università di Roma (author)
Crystallographic and spectroscopic characterisation of a natural Zn-rich spinel approaching the endmember gahnite (ZnAl2O4) composition
- Article/chapterEnglish2013
Publisher, publication year, extent ...
- 2018-07-05
- Mineralogical Society,2013
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:nrm-227
- https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-227URI
- https://doi.org/10.1180/minmag.2013.077.7.05DOI
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- Language:English
- Summary in:English
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- The crystal chemistry of a natural, gem-quality, blue-grey Zn-rich spinel crystal from Jemaa, Kaduna State, Nigeria, was studied using electron microprobe, single-crystal X-ray diffraction, optical absorption and Raman spectroscopies. The composition of the crystal approaches the gahnite endmember (ZnAl2O4), ∼94 mol.%, with the remainder being dominated by a hercynite component (FeAl2O4). The unit-cell dimension is 8.0850(3) Å and the tetrahedral and octahedral bond distances are determined asT–O 1.9485(6) Å andM–O 1.9137(3) Å. Crystal chemical analysis resulted in the empirical structural formulaT(Zn0.94Fe2+0.03Al0.03)M(Al1.96Fe2+0.03Fe3+0.01)O4, which shows Zn and Al almost fully ordered in the tetrahedrally and octahedrally coordinatedTandMsites, respectively. Raman spectra obtained using the excitation of the blue 473.1 nm line of a Nd:YAG laser display three of the five Raman-active modes predicted for the general oxide spinel group of minerals. These are the Egmode at 420.6 cm–1and the T2gmodes at 510 cm–1and 661 cm–1, due to vibrations in the AlO6octahedra. Optical absorption spectra recorded in the UV/VIS-NIR-MIR range 2000 29000 cm–1show a dominant absorption band at ∼5000 cm–1which is caused by spin-allowed electronicd–dtransitions in Fe2+located at theTsites. The blue-grey hue exhibited by the sample is mainly due to spin-forbidden electronic transitions inTFe2+and toMFe2+↔MFe3+intervalence charge transfer, and the poor saturation of the colour is due to the small concentration of Fe2+and Fe3+.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Geokemi hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geochemistry hsv//eng
- The changing Earth
- Den föränderliga jorden
Added entries (persons, corporate bodies, meetings, titles ...)
- Andreozzi, Giovanni B.Sapienza Università di Roma (author)
- Bosi, FerdinandoNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)ferdbosi (author)
- Hålenius, UlfNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)ulfhalen (author)
- Mantovani, L.Università di Parma (author)
- Bersani, D.Università di Parma (author)
- Fregola, Rosa AnnaUniversità di Bari (author)
- Sapienza Università di RomaEnheten för geovetenskap (creator_code:org_t)
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- In:Mineralogical magazine: Mineralogical Society77, s. 2941-29530026-461X1471-8022
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