Meteoritical Bulletin: Entry for Northwest Africa 4272

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Northwest Africa 4272

Basic information

Name: Northwest Africa 4272
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4272
Observed fall: No
Year found: 2003
Country: Western Sahara
Mass: 6.77 kg

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	Diogenite
Recommended:			Diogenite [explanation]

This is 1 of 545 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 1 Sep 2006

Writeup

help

Writeup from MB 92:

Northwest Africa 4272

Northwest Africa

Find: December 2003

Achondrite (diogenite)

History: An anonymous collector recovered a single, complete stone in the western part of the Sahara in December 2003.

Physical characteristics: The individual is 6768 g and displays a partial fusion crust and regmaglypts.

Petrography: (A. Seddiki, Ud'OEA and UJM; M. Messaoudi, USTHB, Algeria; B. Moine, J.Y. Cottin, UJM; B. Devouard, UBP; M. Denise, V. Sautter, J.P. Lorand, MNHNP). The sample is composed of Ca-poor pyroxene containing small opaque inclusions of spinel, troilite and metallic Fe-Ni (Ni 0.3 wt%). Specimen is cross cut by thin veins (50 mm) of plagioclase and displays small concentrations of Ca-rich pyroxene.

Mineral compositions: Ca-poor pyroxene (Fs_21.6-22.2Wo_1.6-2.9), spinel inclusions (cr# = 0.85). Vein material: plagioclase (An_81.5-86.3), Ca-rich pyroxene (Fs_7.75-8.1, Wo_45.3-4537). Pyroxenes (Fe/Mn = 24.7 to 31.9[atomic]). Oxygen isotopes: (R. Greenwood, OU) δ¹⁸O = 3.78 and δ¹⁷O =1.50, Δ¹⁷O = -0.46 (all ‰).

Classification: Achondrite (diogenite); minor shock and weathering.

Type specimens: A total of 20 g of sample is on deposit at MNHNP. One thin section is on deposit at UBP. An anonymous finder holds the main mass.

Data from:
  MB92
  Table 2
  Line 21:

Place of purchase:	Northwest Africa
Date:	Dec-2003
Mass (g):	6768
Pieces:	1
Class:	Dio
Type spec mass (g):	20

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)
UBP: Universite Blaise Pascal, Clermont-Ferrand, France (institutional address)
UJM: Université Jean Monnet, Saint-Etienne, France (institutional address)
USTHB: Université des Sciences et de la Technologie Houari Boumediene, Algers, Algeria; Website (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Michel Franco

Geography:

Western Sahara

Western Sahara

Coordinates:

Unknown.

Statistics:
This is 1 of 286 approved meteorites from Western Sahara (plus 20 unapproved names)

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