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Northwest Africa 11491
Basic information Name: Northwest Africa 11491
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11491
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 187.2 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 28 Nov 2017
Writeup from MB 106:

Northwest Africa 11491 (NWA 11491)

(Northwest Africa)

Purchased: 2017 Apr

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Fabien Kuntz in April 2017 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed mainly of eucritic debris with minor (~2 vol.%) diogenitic orthopyroxene and olivine. Other minerals are exsolved pigeonite (pale orange in thin section), shocked calcic plagioclase (now maskelynite with peculiar vesicle-rich cores), silica polymorph, chromite and troilite.

Geochemistry: Low-Ca pyroxene host (Fs53.2-54.0Wo5.4-5.7, FeO/MnO = 28-29, N = 2), high-Ca pyroxene exsolution lamellae (Fs19.5Wo43.7; Fs28.4Wo38.9; FeO/MnO = 23-26; N = 2), diogenitic orthopyroxene (Fs24.3Wo2.2, FeO/MnO = 28), olivine (Fa47.1-50.3, FeO/MnO = 53-55, N = 2), maskelynite (An88.4-92.2Wo0.4-0.2, N = 2).

Classification: Eucrite (polymict breccia, shocked).

Specimens: 22.9 g including one polished thin section at PSF; remainder with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2017 Apr
Mass (g):187.2
Shock stage:high
Weathering grade:low
Fayalite (mol%):47.7-50.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.9
Type spec location:PSF
Main mass:F. Kuntz
Comments:Work name K362; 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)
Kuntz: Fabien Kuntz, France; Website (private address)
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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Don Cuarzo   
Ryan Upchurch   

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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