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Northwest Africa 8791
Basic information Name: Northwest Africa 8791
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8791
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 241 g
Classification
  history:
Recommended:  R3-5    [explanation]

This is 1 of 13 approved meteorites classified as R3-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 22 Jun 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 8791 (NWA 8791)

(Northwest Africa)

Purchased: 2011 Jun

Classification: Rumuruti chondrite (R3-5)

History: Purchased by Fabien Kuntz in June 2011 from a Moroccan dealer at the Ensisheim Show.

Physical characteristics: Single stone (241 g) with an overall light-brown color and composed of small clasts in a finer-grained matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of equilibrated Type 5 clasts (containing sparse chondrules), separated well-formed, forsterite-bearing Type 3 chondrules ((apparent diameter 470±210 μm)) and angular mineral fragments in a finer grained matrix (orange-brown in thin section). Accessory minerals include Ti-V-Al-bearing chromite, troilite, Ni-bearing pyrrhotite and minor altered kamacite.

Geochemistry: Olivine in Type 5 clasts (Fa39.2-39.9, N = 3), magnesian olivine in Type 3 chondrules (Fa3.2-4.5, N = 2), orthopyroxene (Fs2.2-30.3Wo0.2-3.2, N = 3), augite (Fs27.7Wo39.2; Fs12.1Wo44.0, N = 2), fayalite (Fa71.4).

Classification: R3-5 chondrite.

Specimens: 21.2 g plus one polished thin section at PSF; 21.29 g at MGC; main mass with Kuntz.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2011 Jun
Mass (g):241
Pieces:1
Class:R3-5
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):39.2-39.9
Ferrosilite (mol%):2.2-30.3
Wollastonite (mol%):0.2-3.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.2
Type spec location:PSF
Main mass:F. Kuntz
Comments:work name K189; submitted by A. Irving
Institutions
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
MGC: Muséum Georges Cuvier, Montbéliard, France (institutional address; updated 1 Oct 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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)
Mike Markowitz   
Public domain photographs:
P. Sipiera      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6506 approved meteorites from (Northwest Africa) (plus 2021 unapproved names)

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