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Northwest Africa 6583
Basic information Name: Northwest Africa 6583
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6583
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 1825 g
Meteoritical Bulletin:  MB 100  (2012)  Iron, ungrouped 
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 149 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Comments: Approved 6 Jun 2011
Writeup from MB 100:

Northwest Africa 6583 (NWA 6583)

(Northwest Africa)

Purchased: 2010 Oct

Classification: Iron meteorite (ungrouped)

History: A single iron mass was purchased from a Moroccan dealer in October 2010 by M. Graul, Bernau, Germany.

Physical characteristics: The 1825 g mass, measuring 105 × 100 × 38 mm, has a flattened shape. The part embedded in soil (~40%) is covered by caliche, whereas the exposed surface is glossy-brown and presents 40-45 rounded depressions from 0.5 to 1 cm in diameter.

Petrography: (M. D’Orazio, A. Fazio, DST-PI) Etched section shows a polycrystalline texture composed of roughly equiaxal grains (0.1 to 2 cm) of ataxitic Fe-Ni. The Fe-Ni grains have a martensitic texture. Rounded, twinned and polycrystalline inclusions of troilite, rosettes and isolated crystals of graphite, and large skeletal crystals of schreibersite are common. Silicates occur as isolated euhedral crystals of enstatite and rare forsteritic olivine, and as aggregates of enstatite with overgrowths of diopside or with troilite-rich reaction rims. Many troilite grains contain inclusions of several types of Mn-Mg-Fe-Zn-Cu sulfides. Melted crystals of schreibersite and troilite showing dendritic textures are present in the external portion of the section. Terrestrial weathering is low.

Geochemistry: Composition of the metal (ICP-MS; D’Orazio and Folco, 2003) is Co=0.430, Ni=18.0 (both in wt%), Cu=1350, Ga=52, Ge=125, Ir=0.19, Au=1.13 (all in ppm). Composition of the silicates (all mol%): enstatite (En98.2±0.3Wo1.4±0.2), diopside (En51.6±1.0Wo47.8±0.6).

Classification: Iron meteorite, ungrouped, with anomalous structure, silicate inclusions and low weathering.

Specimens: A 60.5 g etched end cut is on deposit at DST-PI. MGraul holds the main mass.

  • D'Orazio M. and Folco L. (2003) Chemical analysis of iron meteorites by inductively coupled plasma-mass spectrometry. Geostand. Newslett. 27, 215-225. (link)
Data from:
  Table 1
  Line 1426:
Date:P 2010 Oct
Mass (g):1825
Class:Iron, ungrouped
Classifier:Massimo D'Orazio, DST-PI
Type spec mass (g):60.5
Type spec location:DST-PI
Main mass:MGraul
Comments:Submitted by Massimo D'Orazio, DST-PI
   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)
MGraul: Mr. Mirko Graul, Quittenring 4, D-16321 Bernau, Germany (private address; updated 24 May 2010)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann   
Mirko Graul                           

     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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