Tuhualite in a peralkaline rhyolitic ignimbrite from Pantelleria, Italy

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Marco E. Ciriotti
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Tuhualite in a peralkaline rhyolitic ignimbrite from Pantelleria, Italy

Messaggio da Marco E. Ciriotti » mer 10 gen, 2018 16:21

Prossima pubblicazione.

Referenza:
▪ Bagiński, B., Macdonald, R., White, J.C., Jezak, L. (2018): Tuhualite in a peralkaline rhyolitic ignimbrite from Pantelleria, Italy. European Journal of Mineralogy, 30, (in press).

Abstract:
An occurrence of the rare mineral tuhualite (NaFe3+Fe2+Si6O15) is reported in a peralkaline rhyolitic ignimbrite from the island of Pantelleria, Italy. The mineral formed during devitrification of glassy fiamme and varies in form from anhedral plates to perfect euhedral in open vesicles. There is significant replacement of FeS2+S by Mn (≤0.37 atoms per formula unit (apfu)) and Zn (≤0.11 apfu), and of Na by K (≤0.13 apfu). The tuhualite possibly formed at temperatures <580 °C at fO2>FMQ in the presence of a hydrous fluid.
Marco E. Ciriotti

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