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Northwest Africa 11989
Basic information Name: Northwest Africa 11989
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11989
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 40.5 g
Recommended:  L3-6    [explanation]

This is 1 of 61 approved meteorites classified as L3-6.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 2 Aug 2020
Writeup from MB 109:

Northwest Africa 11989 (NWA 11989)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L3-6)

History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005, subsequently acquired by the Hollis Collection and then donated to PSF.

Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Breccia composed of sparse discrete, well-formed chondrules (apparent diameter 0.8-1.2 mm, N = 5), together with some more recrystallized Type 5 and Type 6 clasts, in a matrix containing altered metal, chlorapatite and merrillite.

Geochemistry: Olivine (Fa28.9±5.0, range Fa24.9-35.2, N = 7; Cr2O3 in all <0.04 wt.%), orthopyroxene (Fs21.4±0.8Wo1.9±0.1, rangeFs20.8-21.9Wo1.9-1.8, N = 2), clinopyroxene (Fs6.7WO46.6; Fs16.7Wo40.4; N = 2), olivine in Type 6 lithic clast (Fa24.5±0.1, range Fa24.3-24.6, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.53.

Classification: Ordinary chondrite (L3-6 breccia). Affinity to L chondrites is established from olivine composition in equilibrated lithic clasts and bulk magnetic susceptibility.

Specimens: The entire specimen including one polished thin section is at PSF.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):40.54
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):28.9±5.0
Ferrosilite (mol%):21.4±0.8
Wollastonite (mol%):1.9±0.1
Classifier:A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL
Type spec mass (g):40.54
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18029; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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