Meteoritical Bulletin: Entry for Northwest Africa 4269

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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: 54 g

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 293 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 1 Sep 2006

Writeup

help

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 (En_26-27Wo_34-41), hypersthene (En_29-30Wo_6-5), 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)

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Geography:

Algeria

Algeria

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

Statistics:
This is 1 of 61 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
This is 1 of 1399 approved meteorites from Algeria (plus 33 unapproved names) (plus 4 impact craters)

Proximity search:

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