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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:help 45 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 676 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 1 Sep 2006
Writeuphelp
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 (Fa21.3; range: Fa19.1–22.1; n = 5); pigeonite (Fs18.2Wo10.5; range: Fs17.5–18.9, Wo9.6–12.1; 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)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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