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Northwest Africa 2268
Basic information Name: Northwest Africa 2268
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2268
Observed fall: No
Year found: 2002
Country: Algeria
Mass:help 65 g
Classification
  history:
Meteoritical Bulletin:  MB 89  (2005)  Eucrite
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 471 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from MB online:

Northwest Africa 2268

Northwest Africa

Found 2002 September

Achondrite (polymict eucrite)

The meteorite found by Nomads near Tindouf (South West of Algeria) weighs 65 grams and exhibits a fine fusion crust. Mineralogy and classification (A. Seddiki, UO/UJM, B. Moine, J.Y. Cottin, UJM ; V. Sautter, J.P. Lorand, M. Denise, MNHNP): This fine to medium-grained breccia contains mineral fragments of plagioclases (An85-94), pyroxenes (En84-39Wo1-8), spinel (24-51% Cr2O3), olivine (Fa71) and  silica. The rock also contains some basaltic fragments with ophitic, sub-ophitic or cumulative textures, formed by plagioclases (An86 to An91) and pigeonite (En50-33Wo10-20) and certain grains of pigeonite with augite exsolution lamellae (En28-30Wo33-40). Rare impact generated rocks are observed with mineral phenocrysts in a groundmass composed of glass. Grains of pyroxferroite are present and are locally destabilised and product an association of hedenbergite (En3-14Wo39-40), fayalite (Fa87-93) and silica. Diogenitic fragments are low in abundance (<10%) and are represented essentially by crystals of orthopyroxene. The analyses of the glass fusion crust corresponds to the bulk composition of eucrites and is characterized by high Al2O3 and CaO, and low MgO compared with howardites. The Δ17O (-0.4) of this meteorite is slightly different to HED group; 18O=4.7 and  17O=2.0. Specimens : type specimen, 20.8 g, MNHNP , thin sections, UJM, main mass, finders.

Data from:
  MB89
  Table 7
  Line 153:
Origin or pseudonym:Algeria
Date:Sep 2002
Latitude:28°14'N
Longitude:7°53'W
Mass (g):65
Pieces:1
Class:Euc
Fayalite (mol%):71
Ferrosilite (mol%):16-61
Type spec mass (g):20.8
Comments:Plag An85-94; Δ17O =-0.4‰; Undefined note: MNHNP is Museum National d’Histoire Naturelle, Paris, France
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
UJM: Université Jean Monnet, Saint-Etienne, France (institutional address)
UO: Université d'Oran Es-senia, Algeria (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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Geography:

Algeria
Coordinates:
     Recommended::   (28° 14'N, 7° 53'W)

Statistics:
     This is 1 of 33 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 1015 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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