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Northwest Africa 6426
Basic information Name: Northwest Africa 6426
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6426
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 361 g
Meteoritical Bulletin:  MB 102  (2013)  LL7
Recommended:  LL7    [explanation]

This is 1 of 100 approved meteorites classified as LL7.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 22 Oct 2013
Writeup from MB 102:

Northwest Africa 6426 (NWA 6426)

(Northwest Africa)

Purchased: 2010 Oct

Classification: Ordinary chondrite (LL7)

History: Purchased in 2010 October by Jack Schrader from an anonymous dealer in Morocco.

Physical characteristics: A group of 16 identical gray stones partly coated by black fusion crust (total weight 361 g).

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of clasts with a fine, recrystallized metamorphic texture. No chondrules are present. Constituent minerals are olivine, orthopyroxene, augite, sodic plagioclase, chromite, ilmenite, altered kamacite, chlorapatite, taenite (fresh, rounded grains) and troilite.

Geochemistry: Olivine Fa32.0-33.6, orthopyroxene Fs25.7-25.9Wo2.5-2.0, augite Fs11.3-12.2Wo42.3-41.4). Oxygen isotopes (D. Rumble, CIW): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O = 3.74, 3.68; δ18O = 4.78, 4.72; Δ17O = 1.227, 1.195 per mil.

Classification: Ordinary chondrite LL7. This specimen is recrystallized with no chondrules but Fa range and O isotopes are consistent with LL.

Specimens: A total of 20.1 g of material and one polished thin section are on deposit at UWB. Mr. J. Schrader holds the main masses.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2010 Oct
Mass (g):361
Shock stage:low
Weathering grade:low
Fayalite (mol%):32.0-33.6 (n=4)
Ferrosilite (mol%):25.7-25.9
Wollastonite (mol%):2.5-2.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:J. Schrader
Comments:JS10-4; submitted by A. Irving
Plots: O isotopes:  
   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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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