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Northwest Africa 6167
Basic information Name: Northwest Africa 6167
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6167
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 500 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  Iron, ungrouped
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 124 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 6167 (NWA 6167)

(Northwest Africa)

Purchased: 2003

Classification: Iron meteorite (ungrouped)

History: A single iron mass was purchased in Erfoud, Morocco, in December 2003, by F. Kuntz (Besançon, France).

Physical characteristics: The 500 g mass, measuring about 7 × 4 × 4 cm, has a bullet-shaped morphology with some regmaglypts and remnants of the fusion crust.

Petrography: (M. D’Orazio, M. Gemelli, DST-PI) Etched sections show an ataxitic texture. Under high magnification the metal shows a very fine (1-5 µm) intergrowth of kamacite and taenite arranged into a micro-Widmanstätten pattern. Small globular inclusions (to 2 mm) of sulfide-rich material are scattered in the metal. These inclusions are made of a heterogeneous intergrowth of very small (1-10 µm) crystals of kamacite, taenite and schreibersite with interstitial troilite. Some of these inclusions also host small euhedral elongated crystals of chromite. The studied 16.5 cm2 surface contains five rounded silicate inclusions (to 6.8 mm). They consist of prevailing crystals of olivine (Fo79.6±0.6), low-Ca pyroxene (En78-80 Wo2.2-3.1), high-Ca pyroxene (En49-51 Wo41-42), plagioclase (An78-85), Ca-phosphate and chromite. Close to the boundary with the Fe-Ni metal, the silicate crystals are crossed by tiny veinlets of very fine-grained Fe-Ni metal+troilite or iron oxyhydroxides.

Geochemistry: Composition of the metal (ICP-MS; D’Orazio and Folco, 2003) is: Co = 0.929, Ni = 19.0 (both in wt%), Cu = 302, Ga = 11.3, Ge = 51.4, As = 14.5, W = 2.68, Re = 1.73, Ir = 18.7, Pt = 26.4, Au = 1.12 (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 (silicated), Ni-rich ataxite, ungrouped, very low weathering grade.

Specimens: One 21.79 g polished full slice is on deposit at DST-PIKuntz 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 2003
Mass (g):500
Pieces:1
Class:Iron, ungrouped
Classifier:M. D'Orazio
Type spec mass (g):21.8
Type spec location:DST-PI
Main mass:F. Kuntz
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)
Kuntz: Fabien Kuntz, France; Website (private address)
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)
ironee            
Mirko Graul   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6752 approved meteorites from (Northwest Africa) (plus 2052 unapproved names)

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