Mineralogy of the Vicenice iron meteorite

Details Mineralogy of the Vicenice iron meteorite Mineralogy of the Vicenice iron meteorite

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29s.534s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 534-535

Other

Deformation, Iron Meteorites, Meteoritic Composition, Meteoritic Microstructures, Mineralogy, Crystallography, Kamacite, Lamella (Metallurgy), Metallography, Schreibersite, Troilite

Scientific paper

Iron meteorite Vicenice was found in October 1911 in a vicinity of village Vicenice 2 km southwest of the city of Namest' nad Oslavou (Czech Republic). In 1961 the iron was subjected to extensive optical and metallographic study. On the basis of bandwidth of kamacite lamellae (0.63 mm) Vicenice iron belongs to medium octahedrites (Om). According to chemical composition the meteorite is classified as IID iron. Kamacite bands are straight with L/W ratio of about 15 and mean width approximately 0.63 mm. Swathing kamacite enveloping skeletal crystals of schreibersite is also typical. Taenite forms rims around kamacite bands. The distribution of Ni content is as usual in other octahedrites. Maximum Ni concentration is about 40 wt%. Plessite occurs in large fields among kamacite bands as either comb plessite or as net to acicular plessite. Schreibersite was found in three types. Chromite was observed either as euhedral to subhedral crystals or as irregular or spheroidal grains. All analyzed chromites are uniform in their composition. Sections show slight bending of kamacite lamellae, suggesting homogenous deformation when a meteorite was formed by one crystal of gamma phase. The Vicenice meteorite probably had a complex history. When it was formed by gamma phase it underwent an impact responsible for kamacite lamellae bending. Other impact events affected Vicenice iron, producing granulation of kamacite, Neumann bands, and forming Cr-bearing troilites at the expense of Cr-bearing minerals.

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