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Northwest Africa 6166
Basic information Name: Northwest Africa 6166
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6166
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 144 g
Meteoritical Bulletin:  MB 99  (2011)  Iron, ungrouped
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 150 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
Writeup from MB 99:

Northwest Africa 6166 (NWA 6166)

(Northwest Africa)

Purchased: 2005

Classification: Iron meteorite (ungrouped)

History: A single iron mass was purchased in Erfoud, Morocco, in 2005 by F. Kuntz (Besançon, France).

Physical characteristics: The 144 g mass measures 5 × 5 × 1.5 cm and is lens-shaped. The surface of the meteorite is covered by terrestrial iron oxidation products and lacks fusion crust .

Petrography: (M. D’Orazio, M. Gemelli, DST-PI) Etched sections show a microscopic Widmanstätten pattern given by pointed kamacite spindles 30-70 µm wide. Swathing kamacite, nucleated around primary euhedral crystals of schreibersite (100-250 µm in maximum length), is also widespread. The matrix surrounding the kamacite occurs in two different types: some zones have an homogeneous (up to 0.1 mm scale) Ni-rich metal matrix; other zones are made of a rather coarse (10-50 µm) intergrowth of Ni-rich and Ni-poor metal arranged into irregular but continuous ribbons . The heat-altered rim is partially preserved and contains some melted schreibersite crystals showing dendritic structures.

Geochemistry: Composition of the metal (ICP-MS; D’Orazio and Folco, 2003) is: Co = 0.597, Ni = 17.8 (both in wt %), Cu = 499, Ga = 4.4, Ge = < 1, As = 34.5, W = 0.02, Re = < 0.01 , Ir = 0.02, Pt = 0.04, Au = 1.51 (all in ppm).

Classification: Iron meteorite, structurally anomalous plessitic octahedrite, ungrouped, very low weathering grade.

Specimens: One 14.51 g etched full slice and one 6.92 etched endcut are on deposit at DST-PIKuntz 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 0
  Line 0:
Place of purchase:Morocco
Date:P 2005
Mass (g):144
Class:Iron, ungrouped
Classifier:M. D'Orazio
Type spec mass (g):21.4
Type spec location:DST-PI
Main mass:F. Kuntz
Comments:Submitted by M. D'Orazio
   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)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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