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Northwest Africa 4269
Basic information Name: Northwest Africa 4269
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4269
Observed fall: No
Year found: 2004
Country: Algeria
Mass:help 54 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Sep 2006
Writeuphelp
Writeup from MB 92:

Northwest Africa 4269     27°59'0N, 7°35'W

Hamada du Draa, southwest of Algeria

Find: September 2004

Achondrite (eucrite, monomict)

History: Nomads found a complete stone in September 2004 in Hamada du Draa (South West of Algeria).

Physical characteristics:The complete stone is fusion crusted and weighs 54 g.

Petrography: (A. Seddiki, Ud'OEA and UJM; B. Moine, J.Y. Cottin, UJM; M. Denise, V. Sautter, J.P. Lorand, MNHNP). The rock is compact, fine-grained and contains mm-sized metal grains. A heterogeneous granulitic matrix with plagioclase and recrystallised pyroxene, associated with silica, fayalite, Ca-phosphate, iron metal (Ni% <0.1), sulfide, spinel and ilmenite is observed. Some clasts display residual ophitic texture (lath plagioclase with granular exsolved pigeonite).Pyroxenes occur as ferro-pigeonites exsolved in ferro-augite and ferr-hypersthene.Individual augite grains are also observed in the matrix.

Mineral compositions and geochemistry: Augite (En26-27Wo34-41), hypersthene (En29-30Wo6-5), matrix augite grains (En26Wo40). Pyroxene Fe/Mn (27 to 42[atomic]), spinel (Fe-rich chromite, cr# = 0.91).Oxygen isotopes: (R. Greenwood, OU) δ17O = 1.718, δ18O = 3.762, Δ17O = -0.238 (all ‰).

Classification:Achondrite (eucrite, monomict); S3, minor weathering.

Type specimens: A total of 19.2 g of sample is on deposit at MNHNP. Two inclusions and one powder aliquot (1.690 g) are on deposit at UJM. An anonymous finder holds the main mass.

Data from:
  MB92
  Table 2
  Line 19:
Place of purchase:Hamada du Draa
Date:Sep-2004
Mass (g):54
Pieces:1
Class:Euc
Type spec mass (g):19.2
Plots: O isotopes:  
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UJM: Université Jean Monnet, Saint-Etienne, France (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:
     Recommended::   (27° 59'N, 7° 35'W)

Statistics:
     This is 1 of 32 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 970 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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