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Northwest Africa 11981
Basic information Name: Northwest Africa 11981
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11981
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 1343 g
Meteoritical Bulletin:  MB 108  (2020)  H4
Recommended:  H4    [explanation]

This is 1 of 6038 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Jun 2019
Writeup from MB 108:

Northwest Africa 11981 (NWA 11981)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (H4)

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) Relatively small, well-formed chondrules (apparent diameter 590±450 µm, N = 21) are set in a matrix containing fairly abundant altered metal, chlorapatite and merrillite.

Geochemistry: Olivine (Fa19.1±0.4 (range Fa18.7-19.9), Cr2O3 in ferroan examples <0.04 wt.%, N = 7), magnesian olivine core (Fa5.1), low-Ca pyroxene (Fs7.9±7.5Wo1.6±1.5 (range Fs2.6-16.4Wo0.2-1.5), N = 3), high-Ca pyroxene (Fs6.8Wo45.3; Fs8.9Wo40.8).

Classification: Ordinary chondrite (H4).

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):1343
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):19.1±0.4
Ferrosilite (mol%):7.9±7.5
Wollastonite (mol%):1.6±1.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):1343
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18021; 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 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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