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American Mineralogist; September 2000; v. 85; no. 9; p. 1172-1174
© 2000 Mineralogical Society of America
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Aluminium coordination in tektites: A XANES study

Gabriele Giuli1,2,*, Giovanni Pratesi3, Marcello Corazza1 and Curzio Cipriani3,{dagger}

1 Dipartimento di Scienze della Terra, Università di Firenze, Via G. la Pira 4, 50121 Firenze, Italia
2 Unità INFM, Università di Camerino, 62032, Camerino (MC), Italia
3 Museo di Storia Naturale, sez. Mineralogia e Litologia, Università di Firenze, Via G. La Pira 4, 50121 Firenze, Italia

Correspondence: {dagger} E-mail: musminfi{at}unifi.it

Al K-edge XANES spectra were recorded for six tektites to obtain information on the local structure around Al. Albite, grossular, and andalusite were used as reference materials for Al in fourfold, sixfold, and five+sixfold coordination, respectively. The spectra of the tektites are very similar, except for the intensity of the main absorption edge. Comparison of the spectral features of the tektite glasses with those of the reference materials indicates that Al is tetrahedrally coordinated.




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