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Northwest Africa 11454
Basic information Name: Northwest Africa 11454
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11454
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 352 g
Meteoritical Bulletin:  MB 106  (2018)  Diogenite-pm
Recommended:  Diogenite-pm    [explanation]

This is 1 of 49 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 13 Oct 2017
Writeup from MB 106:

Northwest Africa 11454 (NWA 11454)

(Northwest Africa)

Purchased: 2017 Apr

Classification: HED achondrite (Diogenite, polymict)

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

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisiting mostly of angular grains of diogenitic orthopyroxene (exhibiting undulose extinction) plus sparse harzburgitic diogenite clasts and rare subophitic eucrite clasts set in a sparse finer grained matrix. Other minerals are exsolved pigeonite, calcic plagioclase, silica polymorph (some rimmed by orthopyroxene+olivine), chromite, ilmenite, merrillite and troilite.

Geochemistry: Diogenitic orthopyroxene (Fs26.3Wo5.2; Fs31.9Wo3.70; FeO/MnO = 28-30; N = 2), host orthopyroxene (Fs52.5-53.1Wo3.1-3.2, FeO/MnO = 28-29, N = 2), clinopyroxene exsolution lamellae (Fs21.7-26.3Wo43.7-42.0, FeO/MnO = 26-28, N = 2), orthopyroxene rim on silica grain (Fs32.5Wo1.1, FeO/MnO = 34), olivine rim on silica grain (Fa44.5, FeO/MnO = 55), olivine (Fa51.8-52.5, FeO/MnO = 49, N = 2), plagioclase (An90.1-93.7Or0.6-0.4, N = 2).

Classification: Polymict diogenite breccia.

Specimens: 21.11 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):352.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):51.8-52.5
Ferrosilite (mol%):26.3; 31.9; 52.5-53.1; 21.7-26.3
Wollastonite (mol%):5.2; 3.7; 3.1-3.2; 43.7-42.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.11
Type spec location:PSF
Main mass:F. Kuntz
Comments:Work name K348; 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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