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Northwest Africa 2902
Basic information Name: Northwest Africa 2902
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2902
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 1000 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  OC-imp melt rock
Recommended:  L-melt rock    [explanation]

This is 1 of 35 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Sep 2005
Revised 9 Sep 2006: Update classification
Writeuphelp
Writeup from MB online:

Northwest Africa 2902

Northwest Africa

Find: 2003

Ordinary chondrite (L-related, impact-melt rock)

History: An anonymous finder recovered several stones weighing 1000 g in total within the North African Sahara in 2003.

Petrography: (A. Greshake, MNB) Shows both Fe,Ni metal-poor and Fe,Ni metal-rich lithologies that both consist of small olivines, pyroxenes, and opaque phases embedded into a glassy Si,Al-rich groundmass. Ca-rich pyroxenes are rare. Olivine (Fa12.9–23.9) and pyroxene (Fs11.2–19.7Wo1.1–2.7) are often compositionally zoned and sometimes pyroxene is overgrown by olivine. No chondrules are observed.

Geochemistry: Oxygen isotopes: (I. Franchi and R. C. Greenwood, OU) Metal-poor lithology: δ17O = +3.24, δ18O = +4.095, ∆17O = +1.106 (all ‰). Metal-rich lithology: δ17O = +3.452, δ18O = +4.505, ∆17O = +1.109 (all ‰).

Classification: Ordinary chondrite (L-related, impact-melt rock); shock-related crystallized impact melt, W1/2.

Specimens: A 22.7 g type specimen and one polished thin section are on deposit at MNB. Stefan Ralew of Germany holds the main mass.

Data from:
  MB90
  Table 2
  Line 158:
Place of purchase:Unknown
Date:2003
Mass (g):1000
Pieces:many
Class:Oc-Imc
Fayalite (mol%):12.9-23.9
Ferrosilite (mol%):11.2-19.7
Type spec mass (g):22.7
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
SR Meteorites   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
André Knöfel   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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