Meteoritical Bulletin: Entry for Northwest Africa 2251

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Northwest Africa 2251

Basic information

Name: Northwest Africa 2251
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2251
Observed fall: No
Year found: 2001
Country: Algeria
Mass: 17 g

Classification
history:

Meteoritical Bulletin:	MB 89	(2005)	Howardite
MetBase:	v. 7.1	(2006)	Howardite
Recommended:			Howardite [explanation]

This is 1 of 453 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Writeup

help

Writeup from MB 89:

Northwest Africa 2251

Found 2001 October

Achondrite (howardite)

A fusion-crusted stone of 17 g was found by nomads on October 2001 near Tindouf (western Algeria). Mineralogy and classification (A. Seddiki, Université d'Oran, Es-Sénia, Algeria, and Universitè Jean Monnet, Saint-Etienne, France; B. Moine, J.Y. Cottin, Universitè Jean Monnet, Saint-Etienne, France; V. Sautter, J.P. Lorand, M. Denise, MNHNP): Cumulate eucritic and diogenitic clasts in a clastic matrix. Eucrite clasts contain plagioclase An₉₀ (range An_88-92), pigeonite (Fs_43-53 Wo_6-20) with exsolved augite (Fs₃₇Wo₂₅)_.Minor minerals are a silica phase, troilite, Ti-chromite (TiO₂ = 1.65 wt. %) and ilmenite. Diogenite clasts are composed by orthopyroxene (Fs_32-36 Wo_2-4) with augite exsolution lamellae (Fs₄₂Wo₄₆), chromite, troilite and ilmenite. The Fe/Mn atomic ratio in pyroxenes ranges from 24 to 30. Eucritic clasts comprise <60 vol. % of the rock. The analyses of the glass in the fusion crust corresponds to the bulk compositions of howardites. The oxygen isotopic composition (¹⁸δO=5.2, ¹⁷δO=2.3, Δ¹⁷O = -0.4) confirms that this rock belongs to the HED suite, although the Δ¹⁷O is slightly lower than the HED grand mean. Specimens: main mass 16 g, MNHNP, thin section, Universitè Jean Monnet, Saint-Etienne, France.

Data from:
  MB89
  Table 7
  Line 136:

Origin or pseudonym:	Tindouf , Algeria
Date:	Oct 2001
Latitude:	27°58'N
Longitude:	7°57'W
Mass (g):	17
Pieces:	1
Class:	How
Ferrosilite (mol%):	43-53
Classifier:	A. Seddiki, Université d'Oran, Es-Sénia, Algeria, and Universitè Jean Monnet, Saint-Etienne, France; B. Moine, J.Y. Cottin, Universitè Jean Monnet, Saint-Etienne, France. V. Sautter, J.P. Lorand, M. Denise, MNHNP)
Type spec mass (g):	16
Main mass:	MNHNP
Comments:	see separate entry; Note omitted from MB89 by accident:

Plots:

O isotopes:

Institutions
and collections

MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)

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Geography:

Algeria

Algeria

Coordinates:
Recommended::	(27° 58'N, 7° 57'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)

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