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Northwest Africa 4271
Basic information Name: Northwest Africa 4271
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4271
Observed fall: No
Year found: 2003
Country: Algeria
Mass:help 6 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 339 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4271             27°57'N, 7°50'W

Hamada du Draa, southwest of Algeria

Find: February 2003

Achondrite (eucrite, polymict)

History: The meteorite found by Nomads in Hamada du Draa, southwest of Algeria.

Physical characteristics: The stone displays a fine fusion crust and weighs 6 g.

Petrography: (A. Seddiki, Ud'OEA and UJM; B. Moine, J.Y. Cottin, UJM; M. Denise, V. Sautter, J.P. Lorand, MNHNP). The stone has a fine to medium grained, brecciated texture containing mineral fragments of plagioclase, diogenitic pyroxenes, spinel, olivine and silica.The rock also contains some basaltic fragments displaying both ophitic and sub-ophitic textures, formed by plagioclase and pigeonite; some pigeonite grains also display augite exsolution lamellae.Diogenitic fragments are low in abundance (<10%).

Mineral compositions and geochemistry: Mineral fragments: plagioclase (An88.4), diogenitic pyroxenes (En67.4-75.9, Wo2.0-3.0), spinel (cr# = 0.89), olivine (Fa67-80).Basaltic fragments: plagioclase (An85.8-93.6), pigeonite (En37.2,Wo7.7), pigeonite with augite lamellae (En39.6,Wo41.4).Oxygen isotopes: (R. Greenwood, OU) δ18O=3.34 and δ 17O=1.25, Δ17O = -0.48 (all ‰).

Classification: Achondrite (eucrite, polymict); moderate shock and minor weathering.

Type specimens: A total of 2.55 g of sample is on deposit at MNHNP. One thin section, one inclusion and a powder aliquot (430 mg) are on deposit at UJM. An anonymous finder holds the main mass.

Data from:
  MB92
  Table 2
  Line 20:
Place of purchase:Hamada du Draa
Date:Feb-2003
Mass (g):6
Pieces:1
Class:Euc
Type spec mass (g):2.55
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° 57'N, 7° 50'W)

Statistics:
     This is 1 of 32 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 964 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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