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The Siena meteorite: Mineralogy and Chemistry

Published online by Cambridge University Press:  05 July 2018

B. Baldanza ,
G. R. Levi-Donati  and
H. B. Wiik
B. Baldanza
Affiliation:
Istituto di Mineralogia, Facoltà di Scienze, Università di Perugia, Italy
G. R. Levi-Donati
Affiliation:
Istituto di Mineralogia, Facoltà di Scienze, Università di Perugia, Italy
H. B. Wiik
Affiliation:
Geologinen Tutkimuslaitos Otaniemi, Finland
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Summary

The principal data are collected about the fall and the distribution of the fragments of the Siena, Italy, meteorite (11·6°E., 43·1°N.). A complete individual, weighing 110·55 g, is described in some detail. Crust morphology, mineralogical composition, and structure were studied. Optical data were established by microscopical analysis and both thin and polished sections were observed. Compared with available electron-probe analysis they are found in good agreement. The chemical analysis is Fe 12·93, Ni 1·39, Co 0·09, FeS 5·46, SiO2 37·10, TiO2 0·14, Al2O3, 3·91 FeO 11·46, MnO 0·35, MgO 23·81, CaO 1·63, Na2O 0·90, K2O 0·16, P2O5 0·44, H2O+ 0·10, H2O− 0·00, Cr2O3 0·56, total 100·43. Siena is an ordinary chondrite, with relatively ambiguous characteristics and evident features of recrystallization and metamorphism.

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 285 , March 1969 , pp. 34 - 44
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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