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| Northwest Africa 11289 | |||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 11289 This is an OFFICIAL meteorite name. Abbreviation: NWA 11289 Observed fall: No Year found: 2012 Country: Morocco Mass:  4.6 kg | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 331 approved meteorites classified as Iron, IIIAB. [show all] Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites | ||||||||||||||||||||||||||
| Comments: |
Approved 28 Jun 2017 Revised 16 Jun 2018: Reclassified by Wasson | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Reclassification of Northwest Africa11289
The NWA 11289 iron meteorite is reclassified as IIIAB instead of IIIE based on new INAA data, measured by J.T. Wasson, UCLA. A major concern for classification was Co, now measured at 5.48 ppm by INAA, vs. 4.6 ppm by ICPMS, which led to the initial classification. With the revised data, NWA 11289 fits IIIAB trends well, especially Ni, Cu, Ga, As, Pt, Ir, and Au. Writeup from MB 106: Northwest Africa 11289 (NWA 11289) Morocco Purchased: 2012 Oct Classification: Iron meteorite (IIIE) History: The meteorite was purchased in Temara from a dealer who bought it in Beni Melal. Petrography: (A. Bouvier, UWO) Weathered interior, medium octaedrite texture. No inclusions were observed in the repository specimen. Rust formed during storage, after it was cut 4 to 5 years before classification. Geochemistry: (A. Bouvier, UWO) Elemental composition in wt%: Ni = 9.7, Co=0.46; and in ppm: Cr=3.8, Cu=131.1, Ga=21.7, As=13.8, W=0.53, Pt=3.2, Ir=0.076 and Au=1.6. Classification: Iron, IIIE based on Ir, Co, Ga, and Au abundances (Malvin et al., 1984). Specimens: One slice of 93 g at UWO. | ||||||||||||||||||||||||||
| Bibliography: |
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| Data from: MB106 Table 0 Line 0: |
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| Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
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| References: | Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press. Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography:
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Statistics: This is 1 of 1837 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||