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European Journal of Mineralogy; September/October; v. 20; no. 5; p. 713-720; DOI: 10.1127/0935-1221/2008/0020-1839
© 2008 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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From field observation to experimental petrology and back - A special issue to honour Werner Schreyer

Crystal chemical and structural characterization of an Mg-rich osumilite from Vesuvius volcano (Italy)

Giuseppina Balassone1,*, Angela Mormone1, Manuela Rossi1, Alessandro Bernardi1, Martin Fisch2, Thomas Armbruster2, Anna Kathrin Malsy2 and Alfons Berger3

1 Dipartimento di Scienze della Terra, Università Federico II, Via Mezzocannone 8, 80134 Naples, Italy
2 Institute of Geological Sciences, Mineralogy-Crystallography, Freiestrasse 3, 3012 Bern, Switzerland
3 Institute of Geological Sciences, Baltzerstrasse 1-3, 3012 Bern, Switzerland

* Corresponding author, e-mail: balasson{at}unina.it

At Vesuvius, osumilite, (K, Na)(Fe, Mg)2(Al, Fe, Mg)3(Si, Al)12O30, has been found for the first time in rare contact-metamorphosed rocks ejected during the 1872 A.D. eruption, one of the most violent eruptions of the 19th century. Chemical analysis shows that osumilite is homogeneous and characterized by high Mg numbers (between 88 and 90). Fe shows an average value of 0.247 apfu and K is always greater than 0.810 apfu, with an average value of 0.872 apfu. Structure refinement is consistent with space group P6/mcc.

Key-words: osumilite, Vesuvius, double-ring silicates, crystal chemistry, crystal structure.






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