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Northwest Africa 11031
Basic information Name: Northwest Africa 11031
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11031
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 273 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 358 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Feb 2017
Writeup from MB 106:

Northwest Africa 11031 (NWA 11031)

(Northwest Africa)

Purchased: 2016 Jun

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Fabien Kuntz in June 2016 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of sparse ophitic eucrite clasts and abundant related crystal debris in a finer grained matrix. Minerals are unexsolved low-Ca pyroxene (pigeonite), high-Ca pyroxenes, calcic plagioclase, silica polymorph, fayalitic olivine, chromite, ilmenite (with included baddeleyite), troilite and Ni-free metal. Some grains of hedenbergite+fayalite+silica symplectite (after pyroxferroite) are present.

Geochemistry: Low-Ca pyroxene (Fs33.9-36.5WoWo5.6-7.0, FeO/MnO = 28; Fs59.0Wo5.1, FeO/MnO = 31; N = 2), high-Ca pyroxene (Fs43.3Wo24.6, FeO/MnO = 29; Fs55.4Wo32.8, FeO/MnO = 34; N = 2), fayalitic olivine (Fa85.4, FeO/MnO = 42).

Classification: Eucrite (polymict breccia).

Specimens: 24.59 g including one polished thin section at PSF; remainder with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2016 Jun
Mass (g):273.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):85.4
Ferrosilite (mol%):33.9-36.5; 59.0; 43.3; 55.4
Wollastonite (mol%):5.6-7.0; 5.1; 24.6; 32.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):24.59
Type spec location:PSF
Main mass:F. Kuntz
Comments:K308; 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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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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