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Northwest Africa 2957
Basic information Name: Northwest Africa 2957
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2957
Observed fall: No
Year found: 1997
Country: (Northwest Africa)
Mass:help 362 g
Meteoritical Bulletin:  MB 91  (2007)  Pallasite-Main gr
Recommended:  Pallasite, PMG    [explanation]

This is 1 of 58 approved meteorites (plus 1 unapproved name) classified as Pallasite, PMG.   [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
Comments: Approved 28 Mar 2007
Revised 26 May 2009: Revised pallasite classifications
Writeup from MB 91:

Northwest Africa 2957


Find: 1997

Pallasite (main group)

History: A complete stone was found in Morocco in 1997 and purchased by S. Hamani in 1999. The stone was cut in 2003 and the pieces were sold to various dealers and collectors.

Physical characteristics: Lightly weathered fusion crust with a dull to shiny luster covers the 362 g stone. Many olivine grains are cleanly exposed at the surface. Vague ablation-melt features are still visible on the metal surface.

Petrography: (T. Bunch and J. Wittke, NAU) Olivine grains up to 1.8 cm are randomly dispersed throughout the metal host. Schreibersite and merrillite typically occur adjacent to olivine. Olivine is only slightly zoned from core to rim. Metal structure shows large taenite centers with kamacite margins and rare plessitic cores. Small pockets of brecciated olivine, schreibersite, and troilite are commonly observed between large olivine grains.

Mineral compositions and geochemistry: Olivine (cores = Fa11.8, rims = Fa12.5; FeO/MnO = 41–44), taenite (Ni = 19.8 wt%), kamacite (Ni = 6.4 wt%), schreibersite (Ni = 30.5 wt%).

Classification: Pallasite (main group); minimal shock and weathering.

Type specimen: A 21 g sample is on deposit at NAU. Herrmann holds the main mass of 170 g.

Data from:
  Table 2
  Line 127:
Place of purchase:Morocco
Mass (g):362
Shock stage:minimal
Weathering grade:minimal
Fayalite (mol%):11.8
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):21.1
Type spec location:NAU
Main mass:Herrmann
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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KD Meteorites   

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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