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Northwest Africa 5289
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:help 296 g
Meteoritical Bulletin:  MB 94  (2008)  Iron IVA
Recommended:  Iron, IVA    [explanation]

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 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:
  Table 2
  Line 99:
State/Prov/County:Northwest Africa
Mass (g):296
Class:Iron IVA
Classifier:M. D’Orazio, DST-PI
Type spec mass (g):31.6
Type spec location:DST-PI
Main mass:Graul
Comments: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)
   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)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dott. Geol. Alberto Giusta   
Mirko Graul   

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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