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Northwest Africa 5289 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 5289 This is an OFFICIAL meteorite name. Abbreviation: NWA 5289 Observed fall: No Year found: 2007 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 83 approved meteorites (plus 1 unapproved name) classified as Iron, IVA. [show all] Search for other: Iron meteorites, IVA irons, and Metal-rich meteorites | ||||||||||||||||||||
Comments: | Approved 16 Dec 2008 | ||||||||||||||||||||
Writeup![]() |
Writeup from MB 94:
Northwest Africa 5289 Northwest Africa Find: 2007 Iron (IVA) History: A single iron mass was purchased from a Moroccan dealer in August 2007 by M. Graul (Bernau, Germany). Physical characteristics: The 296 g mass, measuring approximately 81 × 54 × 30 mm, has a flattened shape. The portion of the surface originally sitting into the soil is partially covered with caliche deposit, whereas the remaining portion appears to be polished by wind-driven sand. No fusion crust is preserved. Petrography: (M. D’Orazio, DST-PI) Widmanstätten pattern with kamacite lamellae (bandwidth = 0.32 ± 0.04 mm) and plessite fields in approximately 1:1 volumetric ratio. The kamacite lamellae show abundant Neumann bands and occasionally are displaced along shear planes. Accessory phases: schreibersite, troilite, chromite (tiny euhedral crystals included in troilite) and anhydrous Fe-phosphate (up to 1.3 mm in maximum length and surrounded by swathing kamacite). Geochemistry: (M. D’Orazio, DST-PI) Composition of the metal (ICP-MS) is Co = 0.404, Ni = 9.02 (both in wt%), Cu = 111, Ga = 2.0, Ge < 1, As = 12.0, W = 0.36, Re = 0.08, Ir = 0.80, Pt = 3.76, Au = 2.33 (all in ppm). Classification: Iron meteorite (IVA), fine octahedrite. Type specimen: A 20.3 g etched endcut sample and 11.3 g of shavings are on deposit at DST-PI. M. Graul holds the main mass. | ||||||||||||||||||||
Data from: MB94 Table 2 Line 99: |
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Institutions and collections |
DST-PI: Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy (institutional address; updated 17 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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Photos: |
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |