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Northwest Africa 11990
Basic information Name: Northwest Africa 11990
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11990
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 25.5 g
Meteoritical Bulletin:  MB 108  (2020)  L3
Recommended:  L3    [explanation]

This is 1 of 724 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 17 Jun 2019
Writeup from MB 108:

Northwest Africa 11990 (NWA 11990)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L3)

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) Fairly closely packed, well-formed chondrules (apparent diameter 840±480 µm, N = 20) are set in a finer grained matrix containing stained metal.

Geochemistry: Olivine (Fa22.3±4.7 (range Fa11.9-24.8), Cr2O3 in ferroan examples 0.04-0.30 wt.%, mean 0.09±0.11 wt.%, N = 7), low-Ca pyroxene (Fs13.9±8.6Wo1.3±1.5 (range Fs2.8-20.9Wo0.3-3.4), N = 4), high-Ca pyroxene (Fs8.4Wo44.4; Fs10.8Wo37.6). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.78.

Classification: Ordinary chondrite (L3).

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):25.54
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):22.3±4.7
Ferrosilite (mol%):13.9±8.6
Wollastonite (mol%):1.3±1.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):25.54
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18030; 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)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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