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Northwest Africa 11423
Basic information Name: Northwest Africa 11423
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11423
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 3.32 kg
Meteoritical Bulletin:  MB 106  (2018)  LL4-6
Recommended:  LL4-6    [explanation]

This is 1 of 78 approved meteorites classified as LL4-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 13 Oct 2017
Writeup from MB 106:

Northwest Africa 11423 (NWA 11423)

(Northwest Africa)

Purchased: 2017 Jun

Classification: Ordinary chondrite (LL4-6)

History: Purchased by Ben Hoefnagels at the Ensisheim Show in June 2017 from a dealer who had obtained the stone from a Moroccan source.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of predominantly type 6 clasts containing rare chondrules, but also separate clasts containing well-formed chondrules with equilibrated olivine and unequilibrated pyroxenes.

Geochemistry: Olivine (Fa32.4-33.6, N = 5), orthopyroxene (Fs23.6Wo3.4, N = 1), pigeonite (Fs25.0Wo8.6; Fs20.4Wo20.0; N = 2), subcalcic augite (Fs16.7-16.9Wo30.4-32.7, N = 2).

Classification: Ordinary chondrite (LL4-6). The ferroan mafic silicate compositions (with some olivine Fa>33.5, similar to e.g., NWA 6588 and NWA 10462) slightly extend the LL composition range.

Specimens: 41.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2017 Jun
Mass (g):3321
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):32.4-33.6
Ferrosilite (mol%):23.6; 25.0; 20.4; 16.7-16.9
Wollastonite (mol%):3.4; 8.6; 20.0; 30.4-32.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):41.1
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH113; submitted by A. Irving
   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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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