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Northwest Africa 8431
Basic information Name: Northwest Africa 8431
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8431
Observed fall: No
Year found: 2013
Country: Western Sahara
Mass:help 2 kg
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 29 May 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8431 (NWA 8431)        24°17.688’N, 15°16.499’W

Western Sahara

Found: 06/2013

Classification: HED achondrite (Eucrite, polymict)

History: (H. Chennaoui Aoudjehane, FSAC) The meteorite was found by the shepherd Mr. Ettalibi Abdelkader on June 2013 in a reg and sold to Mr. Aomar Benchaou Dakhla.

Physical characteristics: The grayish subrounded fragments lack fusion crust. Surface weathering might be enhanced by the close proximity to the Atlantic ocean, which is just 5 km away from the find site.

Petrography: The specimen consists of lithic and mineral clasts set in a fine-grained clastic matrix dominated by calcic plagioclase and exsolved pyroxene. Lithic clasts are basaltic lithologies with variable grain size and dark melt clasts. Mineral fragments are plagioclase and pyroxene. Minor phases include SiO2, chromite, and troilite.

Geochemistry: Low-Ca pyroxene Fs22.8-61.8Wo1.8-6, FeO/MnO=19-35; Ca-pyroxene Fs15.7-40.5Wo30.5-43.5, FeO/MnO=25-36; plagioclase An86-95.2.

Data from:
  MB103
  Table 0
  Line 0:
State/Prov/County:Rio de Oro
Date:06/2013
Latitude:24°17.688'N
Longitude:15°16.499'W
Mass (g):2000.7
Pieces:2
Class:Eucrite-pmict
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):22.8-61.8; 15.7-40.5
Wollastonite (mol%):1.8-6; 30.5-43.5
Classifier:A. Greshake, MNB
Type spec mass (g):21.1
Type spec location:MNB, FSAC
Main mass:Aomar Benchaou Dakhla, Morocco
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:

Western Sahara
Coordinates:
     Recommended::   (24° 17' 41"N, 15° 16' 30"W)

Statistics:
     This is 1 of 50 approved meteorites from Rio de Oro, Western Sahara
     This is 1 of 272 approved meteorites from Western Sahara (plus 20 unapproved names)
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