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Northwest Africa 5804
Basic information Name: Northwest Africa 5804
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5804
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 726 g
Meteoritical Bulletin:  MB 100  (2012)  Iron, IAB-ung 
Recommended:  Iron, IAB-ung    [explanation]

This is 1 of 68 approved meteorites classified as Iron, IAB-ung.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 18 Jul 2011
Writeup from MB 100:

Northwest Africa 5804 (NWA 5804)

(Northwest Africa)

Purchased: Oct 2005

Classification: Iron meteorite (IAB, ungrouped)

History: A single specimen was purchased in October 2005 at the Munich Mineral Fair, Germany, by Andreas Gren from a Moroccan dealer.

Physical characteristics: The 726 g mass has a rounded elongated shape, with a reddish brown exterior.

Petrography: (C. Herd, UAb) Two 2.5 × 5 cm polished and etched slabs reveal an unusual microstructure consisting of cm-sized domains composed of 200 μm scale equigranular kamacite, taenite, and schreibersite grains. Graphite is present as <5 μm grains, 200 μm rounded blebs, and as mm-scale globular aggregates. Centimeter-scale domains are evident in hand specimen, which are consistent with heterogeneous distribution of kamacite, taenite, schreibersite, and graphite.

Geochemistry: INAA data (J. Duke, UAb): Ni = 11.54±0.03 wt%, Co = 0.509±0.003 wt%, Ga = 35.8±0.4 μg/g, Ge = 28±4 μg/g, Ir = 0.196±0.008 μg/g, Au = 1.04±0.02 μg/g, As = 13.0±0.2 μg/g, Cu = 307±23 μg/g, Cr = 32±5 μg/g (uncertainties 1 σ), W < 0.27 μg/g, Re < 0.05 μg/g. Although Ni, Ga and Ge concentrations are similar to the IAB-sLM/sLH group, the Au concentration is well below the minimum 1.3 μg/g required for the IAB-MG complex.

Classification: Iron meteorite, IAB-ungrouped, low shock, low weathering.

Specimens: 15.0 g and 13.7 g slabs and a 3.2 g analyzed sample (including polished mount) at UAb. Main mass with Gren.

Data from:
  Table 1
  Line 1281:
Place of purchase:Munich Mineral Fair
Date:P Oct 2005
Mass (g):726
Class:Iron, IAB-ung
Classifier:C. Herd, UAb
Type spec mass (g):31.9
Type spec location:UAb
Main mass:Andreas Gren
Comments:Submitted by C. Herd
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Gren: Andreas Gren, Hamburg, Germany (private address)
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)
aranemac Photo added 20 Oct 2022
Mirko Graul Photo added 20 Oct 2022
Photo added 20 Oct 2022

     This is 1 of 8744 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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