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Northwest Africa 6163
Basic information Name: Northwest Africa 6163
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6163
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 358 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  Iron, ungrouped
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 129 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 16 Sep 2010
Writeuphelp
Writeup from MB 99:

Northwest Africa 6163 (NWA 6163)

(Northwest Africa)

Purchased: Oct 2008

Classification: Iron meteorite (ungrouped)

History: A single iron mass was purchased from a Moroccan dealer in October, 2008, by M. Graul (Bernau, Germany).

Physical characteristics: The 358 g mass, measuring 70 × 57 × 35 mm, has a cone-like shape with a surface roughly flat and one more convex. The surface is partially (>50%) covered by a brown fusion crust and presents several roughly circular depressions up to 1 cm in diameter.

Petrography: (M. D’Orazio, DST-PI) Etched sections show a well-preserved heat-affected rim and a peculiar internal structure of sub-equant, 5 to 10 mm kamacite grains with prominent Neumann bands between which are comb-net plessite bodies. Troilite occurs within kamacite as 1 to 6 mm rounded inclusions showing lamellar twinning, whereas schreibersite forms 100 to 500 µm subhedral, elongated crystals often grown at the troilite-kamacite interface. Several inclusions of troilite show, towards their contact with the host kamacite, replacements by chalcopyrite. Many small hollow spaces (from 0.5 to 10 mm in length), sometimes lined with black iron hydroxides, characterize the internal structure of this meteorite. Close to the external surface these cavities are filled with rounded, sand-sized, grains of quartz from the desert soil.

Geochemistry: Composition of the metal (ICP-MS; D’Orazio and Folco, 2003) is Co = 0.427, Ni = 8.43 (both in wt%), Cu = 258, Ga = 15.1, Ge = 54.3, As = 11.1, W = 1.55, Re = 0.48, Ir = 4.2, Pt = 9.6, Au = 1.08 (all in ppm). Reference.: D’Orazio, M. and Folco, L. (2003). Chemical analysis of iron meteorites by inductively coupled plasma - mass spectrometry. Geostandards Newsletter 27, 3, 215-225.

Classification: Iron meteorite, ungrouped, with anomalous structure.

Specimens: a 27.7 etched endcut and a 11.8 g etched full slice are on deposit at DST-PI. M. Graul holds the main mass.

Bibliography:
  • 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:
  MB99
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Oct 2008
Mass (g):358
Pieces:1
Class:Iron, ungrouped
Classifier:M. D'Orazio
Type spec mass (g):39.5
Type spec location:DST-PI
Main mass:M. Graul
Comments:Submitted by M. D'Orazio
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)
Catalogs:
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
aranemac   
Dirk Hohmann            
Gregor H.   
Mirko Graul      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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