The Nyir\u00e1brany meteorite is an ordinary chondrite from Hungary that fell in 1914 and, to date, has been studied very little. The aim of this work was to carry out a more detailed examination of this meteorite (using optical polarization microscope, energy dispersive X-ray spectroscopy and Raman microspectroscopy) and re-investigate its previous classi\ufb01cation as an LL5 type
\nordinary chondrite, moreover to complete its classi\ufb01cation with a shock stage and a weathering grade. Our new results indicate that Nyir\u00e1brany could be a transition type between the L and LL chondrites. The main mineral phases of Nyir\u00e1brany are olivine, pyroxene and opaque minerals (e.g. Fe-Ni metal, troilite, chromite), minor constituents are plagioclase, Cl-apatite, cristobalite and glass. The Fe-Ni metal content (1.32 vol%) of Nyir\u00e1brany is typical of the LL group, the Fa-content of olivines (26.71 mol%) is between the range of the L and LL types, while the Fs-content of the low-Ca pyroxenes (20.51 mol%) is typical of the L-chondrites. Chondrules appear in di\ufb00erent sizes, mineral compositions and textures. The textural and mineralogical features
\n(e.g. mostly homogeneous silicate minerals, dominance of clinopyroxenes, recrystallized matrix, well-de\ufb01ned chondrules) indicate petrological type 4-5 for Ny\u00edr\u00e1br\u00e1ny. The shock stage and the weathering grade of this meteorite were examined for the \ufb01rst time. On the basis of the observed optical and textural features of the olivine grains (e. g. sharp optical extinction, irregular and
\nplanar fractures) Nyir\u00e1brany has an S2 shock stage. About 30\u201340% of the opaque phases are a\ufb00ected by oxidation, which shows a W2 weathering grade.<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"
M\u00e9sz\u00e1ros M., Kereszturi A., Ditr\u00f3i-Pusk\u00e1s Z. Meteorites Vol. 3, Nos. 1\u20132, 2014, 19\u201332 DOI 10.5277\/met140102 PDF (full text) Meteorites (Vol. 3) Publishers: Wroc\u0142aw University of Technology, Faculty of Geoengineering, Mining and Geology; Polish Meteorite Society<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59,23,24,7,47],"tags":[1090,1807],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/3936"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3936"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/3936\/revisions"}],"predecessor-version":[{"id":3939,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/3936\/revisions\/3939"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}