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Northwest Africa 11987
Basic information Name: Northwest Africa 11987
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11987
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 98.5 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 27 Jun 2019
Writeup from MB 108:

Northwest Africa 11987 (NWA 11987)

(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 705±260 μm, N=20) are set in a finer-grained matrix containing stained metal.

Geochemistry: Olivine Fa29.8±15.5 (range Fa1.1-58.4), Cr2O3 in ferroan examples 0.04-0.27 wt.%, mean 0.11±0.08 wt.%, N = 7. Low-Ca pyroxene Fs11.6±11.8Wo0.3±0.1 (range Fs3.2-19.9Wo0.2-0.3), N = 2; Fs54.8Wo1.5. High-Ca pyroxene Fs18.2Wo36.1. Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.63.

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):98.45
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):29.8±15.5
Ferrosilite (mol%):11.6±11.8
Wollastonite (mol%):0.3±0.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):98.45
Type spec location:PSF
Main mass:PSF
Comments:CHC18027; 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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