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Northwest Africa 6424
Basic information Name: Northwest Africa 6424
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6424
Observed fall: No
Year found: 2010
Country: Algeria
Mass:help 469 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Achondrite-ung 
Recommended:  Achondrite-ung    [explanation]

This is 1 of 135 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 16 Sep 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6424 (NWA 6424)

Algeria

Purchased: 2010 March

Classification: Ungrouped achondrite

History: Purchased in March 2010 by Stefan Ralew from a Moroccan dealer in Ouarzazate

Physical characteristics: Eight dense, brown stones with a total weight of 469 g.

Petrography: (A. Irving and S. Kuehner, UWS) A protogranular aggregate with triple junction grain boundaries composed mainly of olivine with orthopyroxene, clinopyroxene, altered kamacite, chromite, chlorapatite and troilite. Plagioclase absent.

Geochemistry: Olivine (Fa30.1), orthopyroxene (Fs24.6-24.8Wo2.2), clinopyroxene (Fs10.1-10.2Wo43.8-44.3). Oxygen isotopes (D. Rumble, CIW): δ17O 2.89; δ18O 5.46; Δ17O +0.017 per mil

Classification: Achondrite (ungrouped, brachinite-like). This material is paired with NWA 5400.

Specimens: A total of 22 g and one polished thin section are on deposit at UWS. The main masses are held by Ralew.

Data from:
  MB100
  Table 1
  Line 1374:
Place of purchase:Ouarzazate
Date:P 2010 March
Mass (g):469
Pieces:8
Class:Achondrite-ung
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):30.1
Ferrosilite (mol%):24.6-24.8; 10.1-10.2
Wollastonite (mol%):2.2; 43.8-44.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.3
Type spec location:UWS
Main mass:Ralew
Comments:Submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1294 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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