Meteoritical Bulletin: Entry for Northwest Africa 4240

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Northwest Africa 4240

Basic information

Name: Northwest Africa 4240
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4240
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 45 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	Ureilite
Recommended:			Ureilite [explanation]

This is 1 of 660 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 1 Sep 2006

Writeup

help

Writeup from MB 91:

Northwest Africa 4240

Northwest Africa

Find: 2004

Achondrite (ureilite)

History: A small piece was purchased at the Munich Mineral Fair, Germany, from a Moroccan dealer in 2004. An anonymous finder recovered the meteorites from the western part of the Sahara.

Physical characteristics: A 45 g, angular brown fragment without fusion crust and with a granular, sand-blasted surface. Petrography: (J. Schlüter, Hamb) Coarse-grained granoblastic ureilite texture with olivine and pigeonite. High degree of weathering; metal inclusions in the reduced olivine rims are nearly completely weathered. Intergranular graphite laths (up to 2.5 mm).

Mineral compositions and geochemistry: Olivine (Fa_21.3; range: Fa_19.1–22.1; n = 5); pigeonite (Fs_18.2Wo_10.5; range: Fs_17.5–18.9, Wo_9.6–12.1; n = 6) with Cr₂O₃ = 1.22 wt%.

Classification: Achondrite (ureilite)

Specimens: A total of 10.7 g is on deposit at Hamb. Koblitz holds the main mass.

Data from:
  MB91
  Table 2
  Line 241:

Place of purchase:	Munich, Germany
Date:	2003
Mass (g):	45
Pieces:	1
Class:	Ure
Shock stage:	S3
Weathering grade:	extensive
Fayalite (mol%):	21.3
Ferrosilite (mol%):	18.2
Classifier:	J. Schlüter, Ham
Type spec mass (g):	10.7
Type spec location:	Ham
Main mass:	Koblitz

Institutions
and collections

Hamb: Museum der Natur Hamburg - Mineralogie, Grindelallee 48, D-20146 Hamburg, Germany; Website (institutional address; updated 18 Jan 2024)
Ham: Museum der Natur Hamburg - Mineralogie, Grindelallee 48, D-20146 Hamburg, Germany; Website (institutional address; updated 18 Jan 2024)
Koblitz: Jörn Koblitz, Benquestrasse 27, D-28209 Bremen, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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