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Northwest Africa 5191 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 5191 This is an OFFICIAL meteorite name. Abbreviation: NWA 5191 Observed fall: No Year found: 2006 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 58 approved meteorites classified as Brachinite. [show all] Search for other: Brachinites, Primitive achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 17 Apr 2008 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 94:
Northwest Africa 5191 Northwest Africa Find: June 2006 Achondrite (brachinite) History: A single stone was found in 2006 by anonymous finder in northwest African desert. Physical characteristics: Partially crusted stone of 26.5 g. Petrography: (A. Ibhi, Laboratory of Petrology, Mineralogy and Materials, Faculty of Sciences, Agadir (LPMM), and M. Van Ginneken and L. Folco, MNA-SI) It is a fine-grained (average grain size in the 100–200 μm range) granoblastic rock, consisting mainly of polygonal olivine, minor polygonal chromite and interstitial augite, and lesser, Fe-sulfide, enstatite and metal. Mafic silicates are devoid of shock features. Although the silicate minerals are fresh, terrestrial weathering has altered some of the primary sulfides and metal to hydroxides, which may also form thin veinlets along grain boundaries. Geochemistry: Olivine (Fa32.5), augite (Fs10 Wo45). Classification: Brachinite, S1, moderate weathering. Texture, mineral mode and mineral composition of mafic silicates suggest pairing with NWA 3151. Type specimen: A total of 26.5 g and one thin section are on deposit at LPMM [IZU], one polished thin section at MNA-SI. | ||||||||||||||||||||||||||||
Data from: MB94 Table 2 Line 95: |
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Institutions and collections |
MNA-SI: Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy; Website (institutional address; updated 13 Dec 2011) IZU: Laboratory of Petrology, Mineralogy and Materials, Ibn Zohr University, Faculty of Sciences, Agadir, BP 8106, Morocco (institutional address; updated 12 Feb 2011) LPMM: Laboratory of Petrology, Mineralogy and Materials, Ibn Zohr University, Faculty of Sciences, Agadir, BP 8106, Morocco (institutional address; updated 16 Oct 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Geography: |
Statistics: This is 1 of 9344 approved meteorites from (Northwest Africa) (plus 1872 unapproved names) |